I have to agree with bigdogchris.
A useful list would be one that lists only titles where you will get something out of having a dedicated piece of hardware for physx.
For example mirror's edge has physx yes, but my computer can do everything that game requires at high frame rates (using the CPU for physx). There would be no point for me to buy hardware for mirror's edge because it wouldn't change anything.
I completely take this back. Performance died when I actually found something Physxical.
This brings up another issue though. The list is somewhat helpful, but to be really helpful it needs to state what Physx does in each game. Because the only thing I saw in Mirror's Edge was glass breaking ~ and it was a pretty minor difference.