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 enjoyed playing the Trine series with a friend online. You can co-op as two and share the third person in the trio or co-op as a group of three. It's a nice RPG-style game with great art and a smooth mechanics.

Reply
  • I enjoyed playing the Trine series with a friend online. You can co-op as two and share the third person in the trio or co-op as a group of three. It's a nice RPG-style game with great art and a smooth mechanics.

Children
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