Coop game suggestions

[Owlslayer]

Swat 4 and Left 4 dead 1/2.
I'm a huge fan of the L4D series myself, can't recommend it enough!

Oh yeah, I've also heard that Borderlands can be really fun in co-op.

 

[jacobythehedgehog]

Hunted: The Demon's Forge is an amazing game. It is my favorite game I have played so far this year. I liked it even more then Portal 2 and Dungeon Seige III, which are other amazing co-op games