Game recomendations wanted for PS2 or PSP

[jimothy]

I'm a big fan of platform type games. I've got all 4 Jak games, and all 4 Ratchet and Clank games, and I've played them to death.

Can anyone recommend any similar games for the PSP/PS2? I'm eagerly awaiting Daxter on the PSP but need something in between to keep me going...

[steve_evil]

Psychonauts on the PS2 is awesome.