Burnout Legends - By far the best racing game.
I was disapointed with Wipeout Pure after reading reviews and hearing other peoples opinions. The graphics are excellent (the best on PSP) and the framerate remains constant throughout, but this comes at a price. At no point in the game do you feel like you are going the speed it says you are. 800km/h feels more like 80km/h. Burnout is the complete opposite, it feels really fast (maybe too fast). You really have to concentrate hard. The framerate drops are bearly noticeable. It is also a big game with many cars and tracks to unlock, it will keep you occupied for a long time.
Maybe Wipeout is not my kind of game, but I think it is the weakest PSP game I own. My other games are THUG2, GTA:LCS and Burnout.