some of the downloads are a bit long. but the one i recommend is Animusic
If you can run these tech demos you are good. I only had a few lag with a lot of stuff going on the screen and i have a ATi Radeon 9700 moble in a Apple Powerbook G4 1.67ghz, oh i am also at 1440x960 res.
Graphic Card show off
Threaded Mode