If you like guitar hero, check out rock band. You can do more than just guitar--which is good for me, because I hate guitar. Now you can play drums, or even sing.
And drums are insanely fun, btw. I played them for almost two hours last night, and only stopped because my right ankle, which was manning the bass durm pedal, completely cramped up on me. I'm adding drum set to the ever growing list of instruments that I am going to learn after I graduate.
Rock Band
drums ftw!