Beryl

Ubuntu with Beryl Theme (looks like Vista has no USP)

http://www.youtube.com/watch?v=ZD7QraljRfM (Fire)

http://www.youtube.com/watch?v=2eDI4-IH58s (3D Cube)

http://www.youtube.com/watch?v=kYgV2GlsufI (Matrix 3D)

Beryl Project
Beryl is an OpenGL accelerated desktop that seeks to provide a free, open source desktop experience to the community that reflects the wishes of the users. Beryl is a combined window manager and composite manager written in C using OpenGL to provide acceleration.
http://www.beryl-project.org/