Everyone with a PS3 (or a PC for that matter) should download and run folding@home, but that's getting a little off topic.
Anyway, sorry I misunderstood you earlier John. PS3 backwards compatability is very accessible. Put in the game and go, and if you have one of the ones with the PS2 hardware in it like mine, just about every PSX and PS2 game works. And then there's the fact that they intend to eventually let people download entire PSX games to play on the PS3 (they already do this for the PSP through the Playstation store, so letting the PS3 run them too is only a natural extension). Pretty nice if you ask me.