Square Enix has wasted no time in making their impression on the PSP. Crisis Core is an awesome game, and Dissidia: Final Fantasy is looking even better. I haven't played any of the Kingdom Hearts games (isn't their a third one?), but I'll be trying to catch up on them so I know what's going on. I know the basic concept of the Heartless and Nobodies and Keyblades, but since I don't have a PS2, I'll half to watch alot of cutscenes on Youtube and whatnot...
I was hoping they'd re-release the Kingdom Hearts games on the PSP, but they aren't doing that, either.