N-Sider reports that third party company Metro 3D is bringing Armada2: Exodus to GameCube. This will be an online cooperative shooter that also includes RPG elements. The game is also set to get a release on PS 2 and X-Box.
It's still unknown whether the game will support broadband or not.

Can you imagine? Sitting behind your TV, with a GameCube controller in your hands and blowing away all enemies controlled by actual gamers! No more blind bots with some low a.i. This game is gonna rock!
Expect a full preview as soon as more details emerge.