Battle Blasters - the action in this game is fantastic, and it's even better when you don't have to hunch over one device! Honorable mentions: Flight Control - the first good BT game we played at work. 10 Pin Shuffle - great game all around, BT doesn't add a whole lot though. F.A.S.T. - one of the most played BT games by us here Nukeball BT - Also pretty good
COD: Zombies. I got to play a game w/ my friend once, and it was really awesome. Until it disconnected for some reason. Then it wasn't so awesome anymore. I'd say Battle Blasters, but I havn't gotten to play multiplayer yet, although I'm sure it'd be sick.
I'm gonna go with Battle Blasters, because it just makes so much sense as a 2 player game. Especially when you get to trash talk your friend while whipping his ass with a laser gun
Battle Blasters, COD Zombies, Labyrinth 2, Real Racing, and Castle Conflict are all good. Madden would be good if the gameplay wasn't really unbalanced