Yeah, what the others said. I suspect it will be another 6-12 months before we know how sustainable a PPU will be. It takes a long time for developers to bring out a new game that would have the PhysX middleware fully integrated and used. DX10 may change that also, and we're waiting for ATI-AMD and nvidia to bring out their versions.
I hope one of the solutions really takes off myself, so that games get much better in the physics department. Pretty looking water, rocks, and faces are nice enough, but I want fully destructable environments and being able to interact with everthing in the game.