This tutorial shows how you can enable Compiz Fusion on an Ubuntu 8.10 (Intrepid Ibex) desktop (the system must have a 3D-capable graphics card - I am using an NVIDIA GeForce FX 5200 here). With Compiz Fusion you can use beautiful 3D effects like wobbly windows or a desktop cube on your desktop.

http://www.howtoforge.com/enabling-compiz-fusion-on-ubuntu-8.10-nvidia