The ageia ppu which is now owned by Nvidia is still a great little utility, it is used in all games that make use of the unreal 3 engine, you can tell this as it lights up when ever i play any game with the unreal 3 engine like mass effect, unreal 3 of course and a few others out there.
It mainly makes physics seem more real and accurate and has boosted my frames in games that use the U3 engine by about 10-15 BUT not in any game that doesnt use the U3 engine that ive seen so far.