I like worms open warfare 2.

I  loved Midnight Club 3 DUB Edition on the Xbox, so I of course got it for the PSP as well.  The loading times are just horrible, but the game is amazing and there is so much customizability in it.  Also, if you are a fan of Diablo-like games, Untold Legends was a great game for me.  Bad story though.  I wasn't a big fan of Untold Legends 2, however.  Although, there is some online play for it.  If you are a fan of old JRPGs, Valkyrie Profile: Lynneth is an amazing addition.  Also, if you are a fan of JRPG's at all, the Tales of the World: Radiant Mythology is insanely fun.  If you were in on the series, there are lots of references to the past games, but even newcomers will enjoy the game.  There is lots and LOTS of hours of fun there.  It isn't a turn by turn RPG like many JRPGs.  I have spent a huge amount of time on it.

hmm, games I rate highly on the PSP;

Worms Open Warfare 2,
Monster Hunter Freedom 2,
Wipeout Pure,
Burnout Dominator,
Burnout Legends,
Crush,
Dungeon Maker Hunting Ground,
Everybody's Golf,
Tekken Dark Resurrection.

Well, I completely unlocked everything and bought all the most expensive cars and everything because I just loved it so much that with the 1.5 to 2 minute load times on EVERYTHING didn't deter me at all.  If you indeed overclock and go along that same route, you will find a PERFECT game if you are a fan of racing games or not.  I am not a racing game fan, but loved Midnight Club 3 DE.  Give it a try.  Thanks for the tip, though UC.  If I feel like playing it again, I'll do exactly that, but as it is, I sold the game.

wipeout GOOD!