Index: src/app/qgisapp.cpp
===================================================================
--- src/app/qgisapp.cpp	(revision 14851)
+++ src/app/qgisapp.cpp	(working copy)
@@ -3532,6 +3532,8 @@
       QSettings settings;
       saveRecentProjectPath( fullPath.filePath(), settings );
     }
+
+    emit projectSaved();
   }
   else
   {
@@ -3578,6 +3580,7 @@
     statusBar()->showMessage( tr( "Saved project to: %1" ).arg( QgsProject::instance()->fileName() ) );
     // add this to the list of recently used project files
     saveRecentProjectPath( saveFilePath, settings );
+    emit projectSaved();
   }
   else
   {
Index: src/app/qgisapp.h
===================================================================
--- src/app/qgisapp.h	(revision 14851)
+++ src/app/qgisapp.h	(working copy)
@@ -785,6 +785,13 @@
       signal for when this happens.
       */
     void newProject();
+    /** emitted when a project file is successfully saved
+      @note
+      This is useful for plug-ins that store properties with project files.  A
+      plug-in can connect to this signal.  When it is emitted, the plug-in
+      knows to write whatever it needs to.
+      */
+    void projectSaved();
 
     //! emitted when a new bookmark is added
     void bookmarkAdded();
Index: src/app/qgisappinterface.cpp
===================================================================
--- src/app/qgisappinterface.cpp	(revision 14851)
+++ src/app/qgisappinterface.cpp	(working copy)
@@ -57,6 +57,8 @@
            this, SIGNAL( newProjectCreated() ) );
   connect( qgis, SIGNAL( projectRead() ),
            this, SIGNAL( projectRead() ) );
+  connect( qgis, SIGNAL( projectSaved() ),
+           this, SIGNAL( projectSaved() ) );
 }
 
 QgisAppInterface::~QgisAppInterface()
Index: src/gui/qgisinterface.h
===================================================================
--- src/gui/qgisinterface.h	(revision 14851)
+++ src/gui/qgisinterface.h	(working copy)
@@ -356,7 +356,16 @@
         Added in v1.6
       */
     void newProjectCreated();
+    /** emitted when a project is saved.  
+    
+        @note
+        A plug-in can connect to this signal to save data associated with the
+        the project.
 
+        Added in v1.7
+      */
+    void projectSaved();
+
 };
 
 // FIXME: also in core/qgis.h