Online CO-OP

What are some good games to play online Co-op on, im already getting into Saints Row 2 but is there any others that are just for 2 peopleOnline CO-OP
Resident Evil 5.Online CO-OP
Resident evil 5, and Army of two are built from with co-op. It hurts the single player game.The gears of war games, and Halo 3 has co-op.
Halo 3, Left 4 Dead, Resident Evil 5, Army of Two, Gears of war 1/2, CoD:WAW. If you don't like shooters I can't think of much else. Maybe Too Human? Depends on you call co-op. Try some sports games.

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