Remember that this is a leaked BETA driver to. I am sure by the time nVidia release official BETA drivers to the public the bugs we have had will be ironed out (hopefully) and maybe even some more game support to.
I would imagine Luka is right, perhaps everygame needs a physx profile as it has to intercept the AGEIA PPU calls and port them over the CUDA.
I'm considering modding my G92GTS BIOS so it has the same device ID as a 9800GTX (that way I will not get left out in the cold if nVidia do play some sort of shady Creativelabs style trick).
John