What about 6200 TurboCache ?
I installed Ubuntu Feisty Fawn yesterday, and tried to use compiz, or beryl or compiz-fusion. With this card (6200 TurboCache) it seems to be impossible. A friend have the same problem, but not on a laptop this time, on his Desktop Computer. This is the only card who doesn't work with compiz, and i ask what do you wait ? Even my old Intel chipset graphics works. Badly but works.
I don't like fiddle, and it could be good that this nVidia works.
This problem seems to be old, what are you doing ?
PS : I tried with a lot of versions of our drivers, it doesn't work.