One game, i wpuld say SOCOM: Tactical Strike. Its not out, start saving your pennies. If you have ever played SOCOM this is a good game, has new features. Also SOCOM: FTB2 is pretty decent and GTA: LC stories is not bad, those are the only two games i own.
I bought my PSP on the premise that i would network it with my PS3, but i still need the latest PSP firmware update.