Dont know the answer to your question but have you got the Kororaa Xgl Live CD 0.1?
The desktop cube and wobbly windows are great :-)
"The Kororaa project has released a live CD demonstrating the new Xgl technology for 3D window manipulation and other unusual effects: "Today I am happy to release a Kororaa live CD showcasing Xgl technology. If you would like to find out what it's all about, then download the CD and boot up your PC! The Live CD comes with X.Org 7.0, GNOME 2.12.2, 3D support and of course Xgl. Supported drivers are 'nvidia' (NVIDIA) and 'fglrx' (ATI). Minimum recommended configuration is Pentium 3 with NVIDIA GeForce video card."
Download here