Here's a nice video from Metacafe which shows off Windows Vista's Aero interface and the XgL+Beryl interface in Ubuntu Linux
Magic Fire, Transparency, Wobbly Windows, 3D Cube, Transparent
Cube, Skydome, 3D Windows and stuff like it... All the stuff more...
that Windows could do on a supercomputer but this time free
and for every (aprox 2years old 3D) graphic card.