What are some good on-line co-op games?

What games do you enjoy playing in on-line co-op? From FPS to sports games what have you really enjoyed? I'm currently playing Golf with Friends and enjoying the simple, sometimes relaxing, sometimes frustrating nature of the game.

Parents
  •  I really enjoyed playing Sniper Elite 4 with a friend. I heard It Takes Two is also a good 2 player co-op and Sony's Sackboy A Big Adventure is coming to pc this fall. All of the Little Big Planet including Sackboy are excellent co-op games. So glad to see at least one of them launching on pc.

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  •  I really enjoyed playing Sniper Elite 4 with a friend. I heard It Takes Two is also a good 2 player co-op and Sony's Sackboy A Big Adventure is coming to pc this fall. All of the Little Big Planet including Sackboy are excellent co-op games. So glad to see at least one of them launching on pc.

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