Compiz Fusion: Power Up your Ubuntu Desktop
Compiz Fusion is a Linux application that can bring 3D capabilities to your desktop. It is a compositing window manager that uses 3D graphics acceleration via OpenGL. It provides various new graphical effects and features on any desktop environment, including GNOME and KDE.
For installing Compiz Fusion, You must have the latest version of your graphics drivers. While you may do it manually, It is easier to automatically install graphics driver using Envy.
A good step by step guide to install Compiz on Ubuntu Intrepid Ibex can be found here.
Compiz is a freeware and works only for Linux, No windows port yet. Check out its official website for more details.