I've been watching these Skate 3 videos recently and they look pretty fun. Are there any skating games for the PSP that have such mind-blowing physics and stuff?
I suggest getting the original Tony Hawk Pro Skater games on the PSX and just play them on the PSP. Otherwise there's not a whole lot else.
The Skate series is SO much better than Tony Hawk games, I remember that there was one being published for the DS and Wii, not sure about PSP though.