diff --git a/SConstruct b/SConstruct
index 8a2316996..dc0f76864 100644
--- a/SConstruct
+++ b/SConstruct
@@ -257,7 +257,7 @@ def configurePlatform(env):
     if not conf.CheckPkgConfig('glibmm-2.4', '2.16'):
         problems.append('Unable to configure Lib glib--, exiting.')
     
-    if not conf.CheckPkgConfig('gthread-2.0', '2.16'):
+    if not conf.CheckPkgConfig('gthread-2.0', '2.12'):
         problems.append('Need gthread support lib for glib-- based thread handling.')
     
     if not conf.CheckPkgConfig('cairomm-1.0', 0.6):
diff --git a/configure.ac b/configure.ac
index 717fe6f4b..0cf1d61bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -141,9 +141,13 @@ PKG_CHECK_MODULES(LUMIERA_COMMON_LIBS, [sigc++-2.0 >= 2.0.17])
 # gtk+-2.0 >= 2.12 gtkmm-2.4 >= 2.12 for Debian Lenny compatibility
 
 PKG_CHECK_MODULES(LUMIERA_GUI, [
-    gtk+-2.0 >= 2.8 gtkmm-2.4 >= 2.8
-    gdl-1.0 >= 0.6.1 cairomm-1.0 >= 0.6.0
-    gavl >= 0.2.5 librsvg-2.0 >= 2.18.1])
+    gtk+-2.0 >= 2.8
+    gtkmm-2.4 >= 2.8
+    cairomm-1.0 >= 0.6.0
+    librsvg-2.0 >= 2.18.1
+    gdl-1.0 >= 0.6.1
+    gavl >= 0.2.5
+    gthread-2.0 >= 2.12.4])
 
 # END Gtk Dependancies
 
diff --git a/src/gui/Makefile.am b/src/gui/Makefile.am
index e46c1e78d..44a77c0c3 100644
--- a/src/gui/Makefile.am
+++ b/src/gui/Makefile.am
@@ -163,6 +163,10 @@ libgui_la_SOURCES =							\
 	$(lumigui_srcdir)/model/sequence.hpp				\
 	$(lumigui_srcdir)/model/clip.cpp				\
 	$(lumigui_srcdir)/model/clip.hpp				\
+	$(lumigui_srcdir)/controller/controller.cpp			\
+	$(lumigui_srcdir)/controller/controller.hpp			\
+	$(lumigui_srcdir)/controller/playback-controller.cpp		\
+	$(lumigui_srcdir)/controller/playback-controller.hpp		\
 	$(lumigui_srcdir)/output/displayer.cpp				\
 	$(lumigui_srcdir)/output/displayer.hpp				\
 	$(lumigui_srcdir)/output/gdkdisplayer.cpp			\
diff --git a/src/gui/controller/controller.cpp b/src/gui/controller/controller.cpp
new file mode 100644
index 000000000..2d7deefc9
--- /dev/null
+++ b/src/gui/controller/controller.cpp
@@ -0,0 +1,41 @@
+/*
+  controllerk.cpp  -  Implementation of the timeline track object
+ 
+  Copyright (C)         Lumiera.org
+    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>
+ 
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+ 
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+ 
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+* *****************************************************/
+
+#include "controller.hpp"
+
+namespace gui {
+namespace controller {
+  
+Controller::Controller(model::Project &model_project) :
+  project(model_project)
+{
+  
+}
+
+PlaybackController& Controller::get_playback_controller()
+{
+  return playback;
+}
+
+}   // namespace controller
+}   // namespace gui
+
diff --git a/src/gui/controller/controller.hpp b/src/gui/controller/controller.hpp
new file mode 100644
index 000000000..27f185e97
--- /dev/null
+++ b/src/gui/controller/controller.hpp
@@ -0,0 +1,56 @@
+/*
+  controller.hpp  -  Declaration of the controller object
+ 
+  Copyright (C)         Lumiera.org
+    2009,               Joel Holdsworth <joel@airwebreathe.org.uk>
+ 
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+ 
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+ 
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+*/
+/** @file controller/controller.hpp
+ ** This file contains the definition of the controller object
+ */
+
+#include "playback-controller.hpp"
+
+#ifndef CONTROLLER_HPP
+#define CONTROLLER_HPP
+
+namespace gui {
+
+namespace model {
+class Project;
+} // namespace model
+  
+namespace controller { 
+
+class Controller
+{
+public:
+  Controller(model::Project &model_project);
+
+  PlaybackController& get_playback_controller();
+
+private:
+  model::Project &project;
+  
+  PlaybackController playback;
+};
+
+}   // namespace controller
+}   // namespace gui
+
+#endif // CONTROLLER_HPP
+
diff --git a/src/gui/controller/playback-controller.cpp b/src/gui/controller/playback-controller.cpp
new file mode 100644
index 000000000..8b79f21d6
--- /dev/null
+++ b/src/gui/controller/playback-controller.cpp
@@ -0,0 +1,207 @@
+/*
+  playback-controller.cpp  -  Implementation of the playback controller object
+ 
+  Copyright (C)         Lumiera.org
+    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>
+ 
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+ 
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+ 
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+* *****************************************************/
+
+#include "playback-controller.hpp"
+#include "../gtk-lumiera.hpp"
+
+namespace gui {
+namespace controller { 
+
+PlaybackController::PlaybackController() :
+  finish_playback_thread(false),
+  playing(false)
+{
+  start_playback_thread();
+}
+
+PlaybackController::~PlaybackController()
+{
+  mutex.lock();
+  finish_playback_thread = true;
+  mutex.unlock();
+  thread->join();
+}
+
+void
+PlaybackController::play()
+{
+  Glib::Mutex::Lock lock(mutex);
+  playing = true;
+}
+
+void
+PlaybackController::pause()
+{
+  Glib::Mutex::Lock lock(mutex);
+  playing = false;
+}
+
+void
+PlaybackController::stop()
+{
+  Glib::Mutex::Lock lock(mutex);
+  playing = false;
+}
+
+bool
+PlaybackController::is_playing()
+{
+  Glib::Mutex::Lock lock(mutex);
+  return playing;
+}
+
+void
+PlaybackController::start_playback_thread()
+{
+  dispatcher.connect(sigc::mem_fun(this, &PlaybackController::on_frame));
+  thread = Glib::Thread::create (sigc::mem_fun(
+    this, &PlaybackController::playback_thread), true);
+}
+
+void
+PlaybackController::attach_viewer(
+  const sigc::slot<void, void*>& on_frame)
+{
+  frame_signal.connect(on_frame);
+}
+
+void
+PlaybackController::playback_thread()
+{  
+  for(;;)
+    {
+      {
+        Glib::Mutex::Lock lock(mutex);
+        if(finish_playback_thread)
+          return;
+      }
+      
+      if(is_playing())
+        pull_frame();
+        
+      Glib::Thread::yield();
+    }
+}
+
+typedef unsigned char byte;
+
+inline int
+clamp(const int &val, const int &maxval, const int &minval)
+{
+  if(val > maxval) return maxval;
+  if(val < minval) return minval;
+  return val;
+}
+
+inline void
+rgb_to_yuv(int r, int g, int b, byte &y, byte &u, byte &v)
+{
+  // This code isn't great, but it does the job
+  y = (byte)clamp((299 * r + 587 * g + 114 * b) / 1000, 235, 16);
+  v = (byte)clamp((500 * r - 419 * g - 81 * b) / 1000 + 127, 255, 0);
+  u = (byte)clamp((-169 * r - 331 * g + 500 * b) / 1000 + 127, 255, 0);
+}
+
+void rgb_buffer_to_yuy2(unsigned char *in, unsigned char *out)
+{
+  for(int i = 0; i < 320*240*2; i+=4)
+    {
+      byte y0, u0, v0;
+      const byte r0 = *(in++);
+      const byte g0 = *(in++);
+      const byte b0 = *(in++);
+      rgb_to_yuv(r0, g0, b0, y0, u0, v0);
+      
+      byte y1, u1, v1;
+      const byte r1 = *(in++);
+      const byte g1 = *(in++);
+      const byte b1 = *(in++);
+      rgb_to_yuv(r1, g1, b1, y1, u1, v1);
+      
+      out[i] = y0;
+      out[i + 1] = (byte)(((int)u0 + (int)u1) / 2);
+      out[i + 2] = y1;
+      out[i + 3] = (byte)(((int)v0 + (int)v1) / 2);
+    }
+}
+
+void
+PlaybackController::pull_frame()
+{
+  static int frame = 0;
+  unsigned char in[320 * 240 * 3];
+  
+  frame--;
+  
+  if(frame <= 0)
+    frame = 200;
+  
+  if(frame > 150)
+  {
+    for(int i = 0; i < 320*240*3; i+=3)
+      {
+        byte value = (byte)rand();
+        in[i] = value;
+        in[i+1] = value;
+        in[i+2] = value;
+      }
+  }
+  else
+  {  
+    unsigned char row[320 * 3];
+
+    
+    for(int x = 0; x < 320; x++)
+      {
+        byte &r = row[x*3];
+        byte &g = row[x*3+1];
+        byte &b = row[x*3+2];
+        
+        if(x < 1*320/7) r = 0xC0, g = 0xC0, b = 0xC0;
+        else if(x < 2*320/7) r = 0xC0, g = 0xC0, b = 0x00;
+        else if(x < 3*320/7) r = 0x00, g = 0xC0, b = 0xC0;
+        else if(x < 4*320/7) r = 0x00, g = 0xC0, b = 0x00;
+        else if(x < 5*320/7) r = 0xC0, g = 0x00, b = 0xC0;
+        else if(x < 6*320/7) r = 0xC0, g = 0x00, b = 0x00;
+        else r = 0x00, g = 0x00, b = 0xC0;
+      }
+    
+    for(int y = 0; y < 240; y++)
+    {
+      memcpy(in + y*320*3, row, sizeof(row));
+    }
+  }
+  
+  rgb_buffer_to_yuy2(in, buffer);
+
+  dispatcher.emit();
+}
+
+void
+PlaybackController::on_frame()
+{
+  frame_signal.emit(buffer);
+}
+
+}   // namespace controller
+}   // namespace gui
+
diff --git a/src/gui/controller/playback-controller.hpp b/src/gui/controller/playback-controller.hpp
new file mode 100644
index 000000000..9333fcbc2
--- /dev/null
+++ b/src/gui/controller/playback-controller.hpp
@@ -0,0 +1,84 @@
+/*
+  playback-controller.hpp  -  Declaration of the playback controller object
+ 
+  Copyright (C)         Lumiera.org
+    2009,               Joel Holdsworth <joel@airwebreathe.org.uk>
+ 
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+ 
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+ 
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+*/
+/** @file controller/playback-controller.hpp
+ ** This file contains the definition of the playback controller object
+ */
+
+#include <sigc++/sigc++.h>
+#include <glibmm.h>
+
+#ifndef PLAYBACK_CONTROLLER_HPP
+#define PLAYBACK_CONTROLLER_HPP
+
+namespace gui {
+namespace controller { 
+
+class PlaybackController
+{
+public:
+
+  PlaybackController();
+  
+  ~PlaybackController();
+
+  void play();
+  
+  void pause();
+  
+  void stop();
+  
+  bool is_playing();
+
+  void attach_viewer(const sigc::slot<void, void*>& on_frame);
+  
+private:
+
+  void start_playback_thread();
+
+  void playback_thread();
+
+  void pull_frame();
+  
+  void on_frame();
+  
+private:
+
+  Glib::Thread *thread;
+  
+  Glib::StaticMutex mutex;
+  
+  Glib::Dispatcher dispatcher;
+  
+  volatile bool finish_playback_thread;
+  
+  volatile bool playing;
+  
+  unsigned char buffer[320 * 240 * 4];
+  
+  sigc::signal<void, void*> frame_signal;
+};
+
+}   // namespace controller
+}   // namespace gui
+
+#endif // PLAYBACK_CONTROLLER_HPP
+
diff --git a/src/gui/gtk-lumiera.cpp b/src/gui/gtk-lumiera.cpp
index 9fd41b94e..eb8fbe023 100644
--- a/src/gui/gtk-lumiera.cpp
+++ b/src/gui/gtk-lumiera.cpp
@@ -31,6 +31,7 @@
 #include "window-manager.hpp"
 #include "workspace/workspace-window.hpp"
 #include "model/project.hpp"
+#include "controller/controller.hpp"
 
 extern "C" {
 #include "common/interface.h"
@@ -43,6 +44,7 @@ using namespace Glib;
 using namespace gui;
 using namespace gui::workspace;
 using namespace gui::model;
+using namespace gui::controller;
 
 
 GtkLumiera the_application;
@@ -55,17 +57,19 @@ namespace gui {
 void
 GtkLumiera::main(int argc, char *argv[])
 {
+  Glib::thread_init();
 
   Main kit(argc, argv);
   
   Glib::set_application_name(AppTitle);
 
   Project project;
+  Controller controller(project);
   WindowManager window_manager;
 
   window_manager.set_theme("lumiera_ui.rc");
 
-  WorkspaceWindow main_window(&project);
+  WorkspaceWindow main_window(project, controller);
 
   kit.run(main_window);
   
diff --git a/src/gui/panels/assets-panel.cpp b/src/gui/panels/assets-panel.cpp
index 316ebf256..1e189c0fc 100644
--- a/src/gui/panels/assets-panel.cpp
+++ b/src/gui/panels/assets-panel.cpp
@@ -26,8 +26,8 @@
 namespace gui {
 namespace panels {
 
-AssetsPanel::AssetsPanel(model::Project *const owner_project) :
-  Panel(owner_project, "assets", _("Assets"), "panel_assets"),
+AssetsPanel::AssetsPanel(workspace::WorkspaceWindow &workspace_window) :
+  Panel(workspace_window, "assets", _("Assets"), "panel_assets"),
   placeholder("Assets/Media")
   {
     pack_start(placeholder);
diff --git a/src/gui/panels/assets-panel.hpp b/src/gui/panels/assets-panel.hpp
index 05c473dca..33513243a 100644
--- a/src/gui/panels/assets-panel.hpp
+++ b/src/gui/panels/assets-panel.hpp
@@ -34,11 +34,12 @@ namespace panels {
 class AssetsPanel : public Panel
 {
 public:
+  
   /**
-   * Constructor
-   *  @param owner_project The project associated with this panel.
+   * Contructor.
+   * @param workspace_window The window that owns this panel.
    **/
-  AssetsPanel(model::Project *const owner_project);
+  AssetsPanel(workspace::WorkspaceWindow &workspace_window);
 
 protected:
   Gtk::Label placeholder;
diff --git a/src/gui/panels/panel.cpp b/src/gui/panels/panel.cpp
index 05fb096b1..aa600cafd 100644
--- a/src/gui/panels/panel.cpp
+++ b/src/gui/panels/panel.cpp
@@ -26,12 +26,11 @@
 namespace gui {
 namespace panels {
 
-Panel::Panel(model::Project *const owner_project,
+Panel::Panel(workspace::WorkspaceWindow &workspace_window,
   const gchar *name, const gchar *long_name,
   GdlDockItemBehavior behavior) :
-  project(owner_project)
+  workspace(workspace_window)
 {
-  REQUIRE(owner_project != NULL);
   REQUIRE(name != NULL);
   REQUIRE(long_name != NULL);
   
@@ -42,12 +41,11 @@ Panel::Panel(model::Project *const owner_project,
   ENSURE(dock_item != NULL);
 }
 
-Panel::Panel(model::Project *const owner_project,
+Panel::Panel(workspace::WorkspaceWindow &workspace_window,
   const gchar *name, const gchar *long_name, const gchar *stock_id,
   GdlDockItemBehavior behavior) :
-  project(owner_project)
+  workspace(workspace_window)
 {
-  REQUIRE(owner_project != NULL);
   REQUIRE(name != NULL);
   REQUIRE(long_name != NULL);
   REQUIRE(stock_id != NULL);
diff --git a/src/gui/panels/panel.hpp b/src/gui/panels/panel.hpp
index 669a7a4f1..941afa0b8 100644
--- a/src/gui/panels/panel.hpp
+++ b/src/gui/panels/panel.hpp
@@ -32,8 +32,8 @@
 
 namespace gui {
 
-namespace model {
-class Project;  
+namespace workspace {
+class WorkspaceWindow;  
 }
 
 namespace panels {
@@ -46,24 +46,24 @@ class Panel : public Gtk::VBox
 protected:
   /**
    *  Constructs a panel object
-   *  @param owner_project The project associated with this panel.
+   *  @param workspace_window The window that owns this panel.
    *  @param name The internal name of this panel
    *  @param long_name The name to display on the caption
    *  @param behavior The GDL behaviour of this item
    */
-  Panel(model::Project *const owner_project,
+  Panel(workspace::WorkspaceWindow &workspace_window,
     const gchar *name, const gchar *long_name,
     GdlDockItemBehavior behavior = GDL_DOCK_ITEM_BEH_NORMAL);
 
   /**
    *  Constructs a panel object with a stock item for a caption
-   *  @param owner_project The project associated with this panel.
+   *  @param owner_window The window that owns this panel.
    *  @param name The internal name of this panel
    *  @param long_name The name to display on the caption
    *  @param stock_id The id of the stock item to display on the caption
    *  @param behavior The GDL behaviour of this item
    */
-  Panel(model::Project *const owner_project,
+  Panel(workspace::WorkspaceWindow &owner_window,
     const gchar *name, const gchar *long_name, const gchar *stock_id,
     GdlDockItemBehavior behavior = GDL_DOCK_ITEM_BEH_NORMAL);
 
@@ -99,7 +99,7 @@ private:
 
 protected:
 
-  model::Project *const project;
+  workspace::WorkspaceWindow &workspace;
 
   GdlDockItem* dock_item;
 };
diff --git a/src/gui/panels/timeline-panel.cpp b/src/gui/panels/timeline-panel.cpp
index f1ca132d2..0c7a566cb 100644
--- a/src/gui/panels/timeline-panel.cpp
+++ b/src/gui/panels/timeline-panel.cpp
@@ -25,7 +25,9 @@
 #include "../gtk-lumiera.hpp"
 #include "timeline-panel.hpp"
 
+#include "../workspace/workspace-window.hpp"
 #include "../model/project.hpp"
+#include "../controller/controller.hpp"
 
 extern "C" {
 #include "../../lib/time.h"
@@ -43,8 +45,9 @@ namespace panels {
   
 const int TimelinePanel::ZoomToolSteps = 2; // 2 seems comfortable
 
-TimelinePanel::TimelinePanel(model::Project *const owner_project) :
-  Panel(owner_project, "timeline", _("Timeline"), "panel_timeline"),
+TimelinePanel::TimelinePanel(workspace::WorkspaceWindow
+    &workspace_window) :
+  Panel(workspace_window, "timeline", _("Timeline"), "panel_timeline"),
   timeIndicator(),
   previousButton(Stock::MEDIA_PREVIOUS),
   rewindButton(Stock::MEDIA_REWIND),
@@ -65,7 +68,7 @@ TimelinePanel::TimelinePanel(model::Project *const owner_project) :
   //  mem_fun(this, &TimelinePanel::on_playback_period_drag_released));
   
   // Hook up notifications
-  project->get_sequences().signal_changed().connect(
+  workspace.get_project().get_sequences().signal_changed().connect(
     mem_fun(this, &TimelinePanel::on_sequence_list_changed));
   
   // Setup the notebook  
@@ -119,15 +122,14 @@ TimelinePanel::~TimelinePanel()
 
 void
 TimelinePanel::on_play_pause()
-{ 
-  // TEST CODE! 
+{
   if(!is_playing())
     {
       play();
     }
   else
     {
-      frameEvent.disconnect();
+      pause();
     }
   
   update_playback_buttons();
@@ -136,12 +138,8 @@ TimelinePanel::on_play_pause()
 void
 TimelinePanel::on_stop()
 {
-  // TEST CODE! 
-  /*timelineWidget.set_playback_point(GAVL_TIME_UNDEFINED);
-  frameEvent.disconnect();
-  show_time(timelineWidget.get_playback_period_start());
-  
-  update_playback_buttons();*/
+  workspace.get_controller().get_playback_controller().stop();  
+  update_playback_buttons();
 }
 
 void
@@ -223,7 +221,7 @@ TimelinePanel::update_notebook()
   old_pages.swap(notebook_pages);
 
   BOOST_FOREACH( shared_ptr< model::Sequence > sequence,
-    project->get_sequences() )
+    workspace.get_project().get_sequences() )
     {
       std::map<const model::Sequence*, shared_ptr<TimelineWidget> >::
         iterator iterator = old_pages.find(sequence.get());
@@ -283,20 +281,21 @@ TimelinePanel::update_zoom_buttons()
 
 void
 TimelinePanel::play()
+{   
+  workspace.get_controller().get_playback_controller().play();
+}
+
+void
+TimelinePanel::pause()
 {
-  /*if(timelineWidget.get_playback_point() == GAVL_TIME_UNDEFINED)
-    timelineWidget.set_playback_point(
-      timelineWidget.get_playback_period_start());
-  frameEvent = Glib::signal_timeout().connect(
-    sigc::mem_fun(this, &TimelinePanel::on_frame),
-    1000 / 25);*/
+  workspace.get_controller().get_playback_controller().pause();
 }
 
 bool
 TimelinePanel::is_playing() const
 {
-  // TEST CODE! - this should be hooked up to the real playback control
-  return frameEvent.connected();
+  return workspace.get_controller().get_playback_controller().
+    is_playing();
 }
 
 void
diff --git a/src/gui/panels/timeline-panel.hpp b/src/gui/panels/timeline-panel.hpp
index 846d675fe..9c860b05a 100644
--- a/src/gui/panels/timeline-panel.hpp
+++ b/src/gui/panels/timeline-panel.hpp
@@ -48,10 +48,9 @@ class TimelinePanel : public Panel
 public:
   /**
    * Constructor
-   *  @param owner_project The project associated with this panel.
+   * @param workspace_window The window that owns this panel.
    */
-  TimelinePanel(model::Project *const owner_project);
-
+  TimelinePanel(workspace::WorkspaceWindow &workspace_window);
 
   /**
    * Destructor 
@@ -88,6 +87,9 @@ private:
   void update_zoom_buttons();
   
   void play();
+  
+  void pause();
+  
   bool is_playing() const;
   
   void set_tool(gui::widgets::timeline::ToolType tool);
@@ -138,7 +140,6 @@ private:
 private:
   // TEST CODE
   bool on_frame();
-  sigc::connection frameEvent;
   
   //----- Constants -----//
 private:
diff --git a/src/gui/panels/viewer-panel.cpp b/src/gui/panels/viewer-panel.cpp
index 070dd2d29..f012a406e 100644
--- a/src/gui/panels/viewer-panel.cpp
+++ b/src/gui/panels/viewer-panel.cpp
@@ -23,17 +23,36 @@
 #include "../gtk-lumiera.hpp"
 #include "viewer-panel.hpp"
 
-using namespace gui::widgets;
+#include "../workspace/workspace-window.hpp"
+#include "../controller/controller.hpp"
+#include "../controller/playback-controller.hpp"
+
 using namespace Gtk;
+using namespace gui::widgets;
+using namespace gui::controller;
 
 namespace gui {
 namespace panels {
 
-ViewerPanel::ViewerPanel(model::Project *const owner_project) :
-  Panel(owner_project, "viewer", _("Viewer"), "panel_viewer")
+ViewerPanel::ViewerPanel(workspace::WorkspaceWindow &workspace_window) :
+  Panel(workspace_window, "viewer", _("Viewer"), "panel_viewer")
 {    
   //----- Pack in the Widgets -----//
   pack_start(display, PACK_EXPAND_WIDGET);
+  
+  PlaybackController &playback =
+    workspace_window.get_controller().get_playback_controller();
+    
+  playback.attach_viewer(sigc::mem_fun(this, &ViewerPanel::on_frame));
+}
+
+void
+ViewerPanel::on_frame(void *buffer)
+{
+  Displayer *displayer = display.get_displayer();
+  REQUIRE(displayer);
+  
+  displayer->put(buffer);
 }
 
 }   // namespace panels
diff --git a/src/gui/panels/viewer-panel.hpp b/src/gui/panels/viewer-panel.hpp
index 027ab1fc2..b56fb3701 100644
--- a/src/gui/panels/viewer-panel.hpp
+++ b/src/gui/panels/viewer-panel.hpp
@@ -42,9 +42,13 @@ class ViewerPanel : public Panel
 public:
   /**
    * Contructor.
-     @param owner_project The project associated with this panel.
+   * @param workspace_window The window that owns this panel.
    **/
-  ViewerPanel(model::Project *const owner_project);
+  ViewerPanel(workspace::WorkspaceWindow &owner_window);
+  
+protected:
+
+  void on_frame(void *buffer);
 
 protected:
 
diff --git a/src/gui/widgets/timeline-widget.cpp b/src/gui/widgets/timeline-widget.cpp
index 9859a3def..0e589bba0 100644
--- a/src/gui/widgets/timeline-widget.cpp
+++ b/src/gui/widgets/timeline-widget.cpp
@@ -484,6 +484,12 @@ TimelineWidget::get_y_scroll_offset() const
   return (int)verticalAdjustment.get_value();
 }
 
+void
+TimelineWidget::set_y_scroll_offset(const int offset)
+{
+  verticalAdjustment.set_value(offset);
+}
+
 bool
 TimelineWidget::on_motion_in_body_notify_event(GdkEventMotion *event)
 {
diff --git a/src/gui/widgets/timeline-widget.hpp b/src/gui/widgets/timeline-widget.hpp
index b95073230..7113d100f 100644
--- a/src/gui/widgets/timeline-widget.hpp
+++ b/src/gui/widgets/timeline-widget.hpp
@@ -226,6 +226,8 @@ private:
   
   int get_y_scroll_offset() const;
   
+  void set_y_scroll_offset(const int offset);
+  
   // ----- Event Handlers -----//
   
   /**
diff --git a/src/gui/widgets/timeline/timeline-header-container.cpp b/src/gui/widgets/timeline/timeline-header-container.cpp
index 172c130d6..4041ab554 100644
--- a/src/gui/widgets/timeline/timeline-header-container.cpp
+++ b/src/gui/widgets/timeline/timeline-header-container.cpp
@@ -36,6 +36,13 @@ using namespace util;
 namespace gui {
 namespace widgets {
 namespace timeline {
+  
+// ===== Constants ===== //
+
+const int TimelineHeaderContainer::ScrollSlideRateDivisor = 4;
+const int TimelineHeaderContainer::ScrollSlideEventInterval = 40;
+
+// ===== Implementation ===== //
 
 TimelineHeaderContainer::TimelineHeaderContainer(
   gui::widgets::TimelineWidget &timeline_widget) :
@@ -176,7 +183,7 @@ bool TimelineHeaderContainer::on_button_release_event (
   
   // Has the user been dragging?
   if(layout.get_dragging_track())
-    layout.end_dragging_track();
+    end_drag();
 
   return Container::on_button_release_event(event);    
 }
@@ -201,14 +208,26 @@ bool TimelineHeaderContainer::on_motion_notify_event (
   if((event->state & GDK_BUTTON1_MASK) && hoveringTrack &&
     !layout.get_dragging_track())
     {
-      layout.begin_dragging_track(mousePoint);
+      begin_drag();      
       return result;
     }
     
   // Are we currently dragging?
   if(layout.get_dragging_track())
     {
+      // Forward the message to the layout manager
       layout.drag_to_point(mousePoint);
+      
+      // Is the mouse out of bounds? if so we must begin scrolling
+      const int height = get_allocation().get_height();
+      const int y = mousePoint.get_y();
+      
+      if(y < 0)
+        begin_scroll_slide(y / ScrollSlideRateDivisor);
+      else if(y > height)
+        begin_scroll_slide((y - height) / ScrollSlideRateDivisor);
+      else end_scroll_slide();
+      
       return result;
     }
   
@@ -304,6 +323,22 @@ TimelineHeaderContainer::on_hovering_track_changed(
   
 
 }
+
+bool
+TimelineHeaderContainer::on_scroll_slide_timer()
+{   
+  // Shift the view
+  const int view_height = get_allocation().get_height();
+  timelineWidget.set_y_scroll_offset(
+    timelineWidget.get_y_scroll_offset() +
+    scrollSlideRate * view_height / 256);
+    
+  // Keep the layout manager updated
+  timelineWidget.layoutHelper.drag_to_point(mousePoint);
+  
+  // Return true to keep the timer going
+  return true;
+}
   
 void
 TimelineHeaderContainer::layout_headers()
@@ -365,6 +400,84 @@ TimelineHeaderContainer::lookup_timeline_track(
   return timeline_track;
 }
 
+void
+TimelineHeaderContainer::begin_drag()
+{
+  TimelineLayoutHelper &layout = timelineWidget.layoutHelper;
+  
+  shared_ptr<timeline::Track> dragging_track =
+    layout.begin_dragging_track(mousePoint);
+  ENSURE(dragging_track); // Something strange has happened if we
+                          // were somehow not hovering on a track
+
+  const TimelineLayoutHelper::TrackTree::pre_order_iterator node =
+    layout.iterator_from_track(dragging_track->get_model_track());
+  set_keep_above_recursive(node, true);
+}
+
+void
+TimelineHeaderContainer::end_drag()
+{ 
+  TimelineLayoutHelper &layout = timelineWidget.layoutHelper;
+  
+  shared_ptr<timeline::Track> dragging_track =
+    layout.get_dragging_track();
+  ENSURE(dragging_track); // Something strange has happened if we
+                          // were somehow not dragging on a track  
+
+  const TimelineLayoutHelper::TrackTree::pre_order_iterator node =
+    layout.iterator_from_track(dragging_track->get_model_track());
+  set_keep_above_recursive(node, false);
+  
+  layout.end_dragging_track();
+}
+
+void
+TimelineHeaderContainer::set_keep_above_recursive(
+  TimelineLayoutHelper::TrackTree::iterator_base node,
+  const bool keep_above)
+{
+  TimelineLayoutHelper::TrackTree::pre_order_iterator iter;
+  
+  const TimelineLayoutHelper::TrackTree &layout_tree =
+    timelineWidget.layoutHelper.get_layout_tree();
+    
+  shared_ptr<timeline::Track> timeline_track =
+    lookup_timeline_track(*node);
+  REQUIRE(timeline_track);
+
+  Glib::RefPtr<Gdk::Window> window =
+    timeline_track->get_header_widget().get_window();
+  ENSURE(window); // Something strange has happened if there was no
+                  // window
+  window->set_keep_above(keep_above);
+  
+  for(iter = layout_tree.begin(node);
+    iter != layout_tree.end(node);
+    iter++)
+    {
+      set_keep_above_recursive(iter, keep_above);
+    }
+}
+
+void
+TimelineHeaderContainer::begin_scroll_slide(int scroll_slide_rate)
+{
+  scrollSlideRate = scroll_slide_rate;
+  if(!scrollSlideEvent.connected())
+    scrollSlideEvent = Glib::signal_timeout().connect(sigc::mem_fun(
+      this, &TimelineHeaderContainer::on_scroll_slide_timer),
+      ScrollSlideEventInterval);
+}
+
+void
+TimelineHeaderContainer::end_scroll_slide()
+{
+  scrollSlideRate = 0;
+  if(scrollSlideEvent.connected())
+    scrollSlideEvent.disconnect();
+}
+
 }   // namespace timeline
 }   // namespace widgets
 }   // namespace gui
diff --git a/src/gui/widgets/timeline/timeline-header-container.hpp b/src/gui/widgets/timeline/timeline-header-container.hpp
index 6526244c3..4b2883d47 100644
--- a/src/gui/widgets/timeline/timeline-header-container.hpp
+++ b/src/gui/widgets/timeline/timeline-header-container.hpp
@@ -29,6 +29,7 @@
 #define HEADER_CONTAINER_HPP
 
 #include "../../gtk-lumiera.hpp"
+#include "timeline-layout-helper.hpp"
 
 namespace gui {
   
@@ -139,6 +140,15 @@ private:
   void on_hovering_track_changed(
     boost::shared_ptr<timeline::Track> hovering_track);
     
+private:
+  /* ===== Internal Event Handlers ===== */
+
+  /**
+   * An internal event handler, which is called when the scroll slide
+   * timer calls it.
+   */
+  bool on_scroll_slide_timer();
+    
   /* ===== Internals ===== */
 private:
 
@@ -172,6 +182,27 @@ private:
    **/
   boost::shared_ptr<timeline::Track> lookup_timeline_track(
     boost::shared_ptr<model::Track> model_track);
+    
+  void begin_drag();
+  
+  
+  void end_drag();
+  
+  void set_keep_above_recursive(
+    TimelineLayoutHelper::TrackTree::iterator_base node,
+    const bool keep_above);
+    
+  /**
+   * Begins, or continues a scroll slide at a given rate
+   * @param scroll_slide_rate The distance to slide every timer event
+   * in units of 1/256th of the view height.
+   */
+  void begin_scroll_slide(int scroll_slide_rate);
+  
+  /**
+   * Ends a scroll slide, and disconnects the slide timer
+   */
+  void end_scroll_slide();
   
 private:
 
@@ -195,11 +226,38 @@ private:
    * click is not processed by track headers.
    **/
   Gtk::Menu contextMenu;
+  
+  /**
+   * This connection is used to represent the timer which causes scroll
+   * sliding to occur.
+   * @remarks Scroll sliding is an animated scroll which occurs when
+   * the user drags a header outside the area of the timeline body.
+   */
+  sigc::connection scrollSlideEvent;
+  
+  /**
+   * Specifies the rate at which scroll sliding is currently taking
+   * place.
+   */
+  int scrollSlideRate;
     
   //----- User Interaction State -----//  
   boost::shared_ptr<timeline::Track> hoveringTrack;
 
   Gdk::Point mousePoint;
+  
+  /* ===== Constants ===== */  
+  /**
+   * The amount to divide the mouse overshoot by to produce the slide
+   * scroll rate.
+   * @remarks Smaller values cause faster scrolling.
+   */
+  static const int ScrollSlideRateDivisor;
+  
+  /**
+   * The interval between scroll slide events in ms.
+   */
+  static const int ScrollSlideEventInterval;
 
   friend class gui::widgets::TimelineWidget;
   friend class timeline::Track;
diff --git a/src/gui/widgets/timeline/timeline-layout-helper.cpp b/src/gui/widgets/timeline/timeline-layout-helper.cpp
index 4efb2cf2a..dccd9d143 100644
--- a/src/gui/widgets/timeline/timeline-layout-helper.cpp
+++ b/src/gui/widgets/timeline/timeline-layout-helper.cpp
@@ -128,32 +128,25 @@ TimelineLayoutHelper::track_from_y(int y)
   return shared_ptr<timeline::Track>();
 }
 
-bool
+shared_ptr<timeline::Track>
 TimelineLayoutHelper::begin_dragging_track(
   const Gdk::Point &mouse_point)
 {
   draggingTrack = header_from_point(mouse_point);
   if(!draggingTrack)
-    return false;
+    return shared_ptr<timeline::Track>();
     
   const Gdk::Rectangle &rect = headerBoxes[draggingTrack];
   dragStartOffset = Gdk::Point(
     mouse_point.get_x() - rect.get_x(),
-    mouse_point.get_y() - rect.get_y());
+    mouse_point.get_y() - rect.get_y() +
+      timelineWidget.get_y_scroll_offset());
   
-  // Find the track in the tree
   const shared_ptr<model::Track> model_track =
     draggingTrack->get_model_track();
-  REQUIRE(model_track);
-  for(draggingTrackIter = layoutTree.begin();
-    draggingTrackIter != layoutTree.end();
-    draggingTrackIter++)
-    {
-      if(*draggingTrackIter == model_track)
-        break;
-    }
+  draggingTrackIter = iterator_from_track(model_track);
     
-  return true;
+  return draggingTrack;
 }
 
 void
@@ -187,7 +180,7 @@ TimelineLayoutHelper::drag_to_point(const Gdk::Point &point)
       const weak_ptr<timeline::Track> track = 
         lookup_timeline_track(*iterator);
       
-      if(util::pt_in_rect(point, headerBoxes[track]))
+      if(util::pt_in_rect(dragPoint, headerBoxes[track]))
         {
           // Relocate the header
           draggingTrackIter = layoutTree.move_after(
@@ -211,6 +204,22 @@ TimelineLayoutHelper::is_animating() const
   return animating;
 }
 
+TimelineLayoutHelper::TrackTree::pre_order_iterator
+TimelineLayoutHelper::iterator_from_track(
+  boost::shared_ptr<model::Track> model_track)
+{
+  REQUIRE(model_track);
+  
+  TrackTree::pre_order_iterator iter;
+  for(iter = layoutTree.begin(); iter != layoutTree.end(); iter++)
+    {
+      if(*iter == model_track)
+        break;
+    }
+    
+  return iter;
+}
+
 void
 TimelineLayoutHelper::update_layout()
 {
@@ -243,24 +252,28 @@ TimelineLayoutHelper::layout_headers_recursive(
   REQUIRE(depth >= 0);
   
   int child_offset = 0;
-  
+    
   TrackTree::sibling_iterator iterator;
   for(iterator = layoutTree.begin(parent_iterator);
     iterator != layoutTree.end(parent_iterator);
     iterator++)
     {
       Gdk::Rectangle rect;
+      int track_height = 0;
+            
       const shared_ptr<model::Track> &model_track = *iterator;
       REQUIRE(model_track);
-      
       shared_ptr<timeline::Track> timeline_track =
         lookup_timeline_track(model_track);
+        
+      const bool being_dragged = (timeline_track == draggingTrack);
             
       // Is the track going to be shown?
       if(parent_expanded)
         {          
           // Calculate and store the box of the header
-          const int track_height = timeline_track->get_height();
+          track_height = timeline_track->get_height() +
+            TimelineWidget::TrackPadding;
           const int indent = depth * indent_width;
           
           rect = Gdk::Rectangle(
@@ -270,19 +283,15 @@ TimelineLayoutHelper::layout_headers_recursive(
             track_height);                                    // height
           
           // Offset for the next header
-          child_offset += track_height + TimelineWidget::TrackPadding;
+          child_offset += track_height;
           
           // Is this header being dragged?
-          if(timeline_track == draggingTrack)
-            {
-              rect.set_y(dragPoint.get_y() - dragStartOffset.get_y());
-            }
+          if(being_dragged)
+            rect.set_y(dragPoint.get_y() - dragStartOffset.get_y());
             
           headerBoxes[timeline_track] = rect;
         }
         
-
-        
       // Is the track animating?
       const bool is_track_animating =
         timeline_track->is_expand_animating();
@@ -292,10 +301,11 @@ TimelineLayoutHelper::layout_headers_recursive(
       const bool expand_child =
         (animating || timeline_track->get_expanded())
           && parent_expanded;
-           
+      
       int child_branch_height = layout_headers_recursive(
-        iterator, branch_offset + child_offset,
-        header_width, indent_width, depth + 1, expand_child);
+        iterator, rect.get_y() + track_height,
+        header_width, indent_width, depth + 1,
+        expand_child);
       
       // Do collapse animation as necessary
       if(is_track_animating)
diff --git a/src/gui/widgets/timeline/timeline-layout-helper.hpp b/src/gui/widgets/timeline/timeline-layout-helper.hpp
index a93f88fa4..68f44939a 100644
--- a/src/gui/widgets/timeline/timeline-layout-helper.hpp
+++ b/src/gui/widgets/timeline/timeline-layout-helper.hpp
@@ -127,7 +127,8 @@ public:
    **/
   boost::shared_ptr<timeline::Track> track_from_y(int y);
   
-  bool begin_dragging_track(const Gdk::Point &mouse_point);
+  boost::shared_ptr<timeline::Track>
+    begin_dragging_track(const Gdk::Point &mouse_point);
   
   void end_dragging_track();
   
@@ -144,6 +145,16 @@ public:
   int get_total_height() const;
   
   bool is_animating() const;
+
+  /**
+   * A utility function which finds the iterator of a track in the
+   * layout tree.
+   * @param model_track The model track to look for.
+   * @return Returns the model iterator of layoutTree.end() if no
+   * iterator was found.
+   **/
+  TrackTree::pre_order_iterator iterator_from_track(
+    boost::shared_ptr<model::Track> model_track);
   
 protected:
   
diff --git a/src/gui/widgets/video-display-widget.cpp b/src/gui/widgets/video-display-widget.cpp
index 0c396ed4d..4a31af101 100644
--- a/src/gui/widgets/video-display-widget.cpp
+++ b/src/gui/widgets/video-display-widget.cpp
@@ -45,6 +45,12 @@ VideoDisplayWidget::~VideoDisplayWidget()
     delete displayer;
 }
 
+Displayer*
+VideoDisplayWidget::get_displayer() const
+{
+  return displayer;
+}
+
 void
 VideoDisplayWidget::on_realize()
 {
@@ -61,21 +67,6 @@ VideoDisplayWidget::on_realize()
   add_events(Gdk::ALL_EVENTS_MASK);
 }
 
-bool 
-VideoDisplayWidget::on_button_press_event (GdkEventButton* event)
-{
-  (void)event;
-  
-  unsigned char buffer[320 * 240 * 4];
-
-  for(int i = 0; i < 320*240*4; i++)
-    buffer[i] = rand();
-
-  displayer->put((void*)buffer);
-
-  return true;
-}
-
 Displayer*
 VideoDisplayWidget::createDisplayer( Gtk::Widget *drawingArea, int width, int height )
 {
diff --git a/src/gui/widgets/video-display-widget.hpp b/src/gui/widgets/video-display-widget.hpp
index 6bf829f7a..6587362cf 100644
--- a/src/gui/widgets/video-display-widget.hpp
+++ b/src/gui/widgets/video-display-widget.hpp
@@ -41,13 +41,12 @@ public:
   VideoDisplayWidget();
 
   ~VideoDisplayWidget();
+  
+  Displayer* get_displayer() const;
 
   /* ===== Overrides ===== */
 private:
   virtual void on_realize();
-  
-  // TEST CODE!!!!
-  virtual bool on_button_press_event (GdkEventButton* event);
 
   /* ===== Internals ===== */
 private:
diff --git a/src/gui/workspace/actions.cpp b/src/gui/workspace/actions.cpp
index ed5a43002..2ac749528 100644
--- a/src/gui/workspace/actions.cpp
+++ b/src/gui/workspace/actions.cpp
@@ -188,7 +188,7 @@ Actions::on_menu_sequence_add()
   dialogs::NameChooser dialog(workspaceWindow,
     _("Add Sequence"), _("New Sequence"));
   if(dialog.run() == RESPONSE_OK)
-    workspaceWindow.get_project()->add_new_sequence(dialog.get_name());
+    workspaceWindow.get_project().add_new_sequence(dialog.get_name());
 }
 
 /* ===== Track Menu Event Handlers ===== */
diff --git a/src/gui/workspace/workspace-window.cpp b/src/gui/workspace/workspace-window.cpp
index ee315e026..24557053d 100644
--- a/src/gui/workspace/workspace-window.cpp
+++ b/src/gui/workspace/workspace-window.cpp
@@ -37,16 +37,17 @@
 
 using namespace Gtk;
 using namespace gui::model;
+using namespace gui::controller;
 
 namespace gui {
 namespace workspace {
 	
-WorkspaceWindow::WorkspaceWindow(Project *source_project) :
+WorkspaceWindow::WorkspaceWindow(Project &source_project,
+  gui::controller::Controller &source_controller) :
   project(source_project),
+  controller(source_controller),
   actions(*this)
-{
-  REQUIRE(source_project != NULL);
-    
+{    
   layout = NULL;
   assetsPanel = NULL;
   viewerPanel = NULL;
@@ -68,12 +69,18 @@ WorkspaceWindow::~WorkspaceWindow()
   timelinePanel->unreference();
 }
 
-Project*
-WorkspaceWindow::get_project() const
+Project&
+WorkspaceWindow::get_project()
 {
   return project;
 }
 
+Controller&
+WorkspaceWindow::get_controller()
+{
+  return controller;
+}
+
 void
 WorkspaceWindow::create_ui()
 {    
@@ -152,11 +159,11 @@ WorkspaceWindow::create_ui()
   baseContainer.pack_start(*toolbar, Gtk::PACK_SHRINK);
   
   //----- Create the Panels -----//
-  assetsPanel = new AssetsPanel(project);
+  assetsPanel = new AssetsPanel(*this);
   ENSURE(assetsPanel != NULL);
-  viewerPanel = new ViewerPanel(project);
+  viewerPanel = new ViewerPanel(*this);
   ENSURE(viewerPanel != NULL);
-  timelinePanel = new TimelinePanel(project);
+  timelinePanel = new TimelinePanel(*this);
   ENSURE(timelinePanel != NULL);
 
   //----- Create the Dock -----//
diff --git a/src/gui/workspace/workspace-window.hpp b/src/gui/workspace/workspace-window.hpp
index 91c16d642..fb0254d2d 100644
--- a/src/gui/workspace/workspace-window.hpp
+++ b/src/gui/workspace/workspace-window.hpp
@@ -46,6 +46,10 @@ namespace model {
   class Project;
 } // model
 
+namespace controller {
+  class Controller;
+} // model
+
 namespace workspace {
 
 /** 
@@ -54,18 +58,25 @@ namespace workspace {
 class WorkspaceWindow : public Gtk::Window
 {
 public:
-  WorkspaceWindow(gui::model::Project *source_project);
+  WorkspaceWindow(gui::model::Project &source_project,
+    gui::controller::Controller &source_controller);
   
   ~WorkspaceWindow();
   
-  gui::model::Project* get_project() const;
+  gui::model::Project& get_project();
+  
+  gui::controller::Controller& get_controller();
 
 private:
   void create_ui();
-
+  
   /* ===== Model ===== */
 private:
-  gui::model::Project *project;
+  gui::model::Project &project;
+
+  /* ===== Controller ===== */
+private:
+  gui::controller::Controller &controller;
 
   /* ===== UI ===== */
 private:
diff --git a/wiki/compatibility.html b/wiki/compatibility.html
index 56353ac46..a014734fe 100644
--- a/wiki/compatibility.html
+++ b/wiki/compatibility.html
@@ -747,7 +747,7 @@ config.macros.timeline.handler = function(place,macroName,params,wikifier,paramS
 }
 //}}}</pre>
 </div>
-<div title="BuildDependencies" modifier="Ichthyostega" modified="200808190851" created="200803261326" changecount="15">
+<div title="BuildDependencies" modifier="Ichthyostega" modified="200901182029" created="200803261326" changecount="16">
 <pre>! Programming Languages
 * C
 ** a C99 compatible compiler, some GCC extensions are used, most are optional.
@@ -787,7 +787,7 @@ config.macros.timeline.handler = function(place,macroName,params,wikifier,paramS
 ** libcairomm-1.0-dev (&gt;=0.6.0)
 ** libgdl-1-dev (&gt;=0.6.1)
 *** libbonoboui2-dev (&gt;=2.14.0)
-** libglibmm-2.4-dev (&gt;=2.16), requiring glib2.0 (&gt;=2.16)
+** libglibmm-2.4-dev (&gt;=2.16), requiring glib2.0 (&gt;=2.16) and gthread-2.0 (&gt;=2.12.4)
 ** libxv-dev ~~(1.0.2 is known to work)~~
 
 
diff --git a/wiki/index.html b/wiki/index.html
index af19d10e4..fc7632387 100644
--- a/wiki/index.html
+++ b/wiki/index.html
@@ -780,7 +780,7 @@ config.macros.timeline.handler = function(place,macroName,params,wikifier,paramS
 }
 //}}}</pre>
 </div>
-<div title="BuildDependenceis" modifier="Ichthyostega" modified="200808190850" created="200708120103" tags="organization buildsys" changecount="18">
+<div title="BuildDependenceis" modifier="Ichthyostega" modified="200901182029" created="200708120103" tags="organization buildsys" changecount="19">
 <pre>for __Building__
 * gcc (4.1), glibc6 (2.3), libstdc++6 (4.1)
 * [[build system|BuildSystem]] dependencies: SCons (0.96.90), Python (2.4), pkg-config
@@ -799,7 +799,7 @@ config.macros.timeline.handler = function(place,macroName,params,wikifier,paramS
 ** libcairomm-1.0-dev (&gt;=0.6.0)
 ** libgdl-1-dev (&gt;=0.6.1)
 *** libbonoboui2-dev (&gt;=2.14.0)
-** libglibmm-2.4-dev (&gt;=2.16), requiring glib2.0 (&gt;=2.16)
+** libglibmm-2.4-dev (&gt;=2.16), requiring glib2.0 (&gt;=2.16) and gthread-2.0 (&gt;=2.12.4)
 ** libxv-dev (&gt;=1.0.2)
 //usually, newer versions are OK//