Splitscreen co-op

I am hanging out with one of my friends this weekend and I am looking to pick up a co-op game we can play on the same tv, does anyone know any good ones.

Well... types of games you both like would certainly help. As far as shooters: Rainbow Six Vegas 2, GRAW 2, both the Gears of War games, and both the Left 4 Dead games are very good for split-screen co-op. Halo has co-op campaign as well, though I'm personally not a Halo fan.

In the non-shooters category, Castle Crashers is a blast for up to 4 players... that might be my favorite 360 game. And it's... $10 I think? Maybe $15 at the most.