From Stephan Huber:

updated XCode project, added osgAnimation framework + one example using it (osganimationviewer). 
Added _OPENTHREADS_ATOMIC_USE_BSD_ATOMIC to local OpenThreads/Config when compiling for the 10.5 SDK.
Some minor fixes on some of the configurations/targets

Xcode/OpenSceneGraph/config/OpenThreads/Config

@@ -1,6 +1,12 @@
 #ifndef _OPENTHREADS_CONFIG
 #define _OPENTHREADS_CONFIG
 
+#include <AvailabilityMacros.h>
+#if defined(MAC_OS_X_VERSION_10_5)
+    #if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+        #define _OPENTHREADS_ATOMIC_USE_BSD_ATOMIC
+    #endif
+#endif
 /* #undef _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS */
 /* #undef _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS */
 /* #undef _OPENTHREADS_ATOMIC_USE_SUN */

Xcode/OpenSceneGraph/osgAnimation-Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>osgAnimation</string>
+	<key>CFBundleGetInfoString</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>org.OpenSceneGraph.osgAnimation</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string></string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>2.7.0</string>
+</dict>
+</plist>

Xcode/OpenSceneGraph/osgVolume-Info.plist

@@ -9,7 +9,7 @@
 	<key>CFBundleGetInfoString</key>
 	<string></string>
 	<key>CFBundleIdentifier</key>
-	<string>org.OpenSceneGraph.osgViewer</string>
+	<string>org.OpenSceneGraph.osgVolume</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundlePackageType</key>

Xcode/OpenSceneGraph/osganimationviewer-Info.plist

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>osganimationviewer</string>
+	<key>CFBundleGetInfoString</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>org.OpenSceneGraph.osganimationviewer</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleShortVersionString</key>
+	<string></string>
+</dict>
+</plist>