I need some good games featuring offline co-op.

My friend just broke his leg and is unable to go anywhere for about a week, so we decided to spend much of that time burning out on some good co-op games for 360. However, we have both already beaten both GoW's, Halo 3 and Left 4 Dead co-op. So, are their any good games featuring offline co-op besides those?

The best one I can think of right now is Resident Evil 5, (demo was amazong, by far best demo I have played) huge focus on 2 player teamwork, but the only one that I can really think of in my mind is Rainbow Six Vegas 2