So my friend and I are looking for games to play co-op in. We just finished Magicka and we're probably going to be playing a game called Dungeonland the next couple weeks, but I'm looking to fill up a gaming backlog of fun co-op games. We've played a lot of co-op games so far. I'll make a list of games that we have played. We're looking for games that are story based co-op, not any FPS that is deathmatch based multiplayer either. We started playing games on Xbox, but we've converted to PC now.

Left4Dead (1 and 2)
Borderlands (1 and 2)
Portal 2
Magicka
Torchlight II
Crackdown (1 and 2)
Resident Evil 5 (I'll be playing 6 with my brother)
Civilization V
Halo 4 (he beat it on Legendary already)
Castle Crashers

I'm sure there are more and I'll edit the list more if I remember any.

Feel free to shoot suggestions or simply discuss your own favorite co-op games.