Diagnostic Screensaver?

I have been trying to find a nice diagnostic screensaver for a while now. Alls Ive found is this junkie thing called Nofkak (spelling?). Anyone got something better(and preferably free)?

Tools wanted: Hardrive speed, CPU temp., RAM usage, etc etc.

Its been over a week. And no replys at all? No one has a good utility screen saver?