Co-op, psn or blu-ray..

Im trying to find a few co-op games to play, anyone have some suggestions?

Its weird, i have 10 ps3 games, many of which i just assumed would have co-op when i bought them, and when I realised this didnt, pretty much stoped playing. I own warhawk, but i dont find the 2 player very fun

If there is a list or if you just know any please let me know, thanks. (I really enjoyed champions of norath, and baldurs gate for ps2, and 2 player lan diablo 2, also co-op resistance was alot of fun)

Pixel Junk Monsters is an awesome game, and with 2-player coop, it becomes even more of a blast to play!

It's a downloadable game off the PSN store though.