PS2 - Are there any two player games where you team up (like old school double dragon, battle toads, etc.)?

[AU Tiger]

Gauntlet: Dark Legacy is a fairly simple multiplayer game.

 

[PeeluckyDuckee]

Hear there's a new Contra coming out for the PS2!! Remember Contra?? The classic game originally for the Nintendo system? I'm looking forward to this game

Oh yeah, Double Dragon, another classic