Want to know how to get in on the action? More Info can be found here.
Be sure to read our co-op review of the title as well.
Don't worry if the Co-Optimus Gamertag is full, there will be plenty of oppurtunities to get in on the action. So join up on Xbox Live and getting to playin some GTA IV tonight!
Also don't forget you can use Xbox Live's built in Matchmaking to find other co-op players. The more people playing, the more people looking, the more people looking - the better chance of playing!