Yeah I've heard about Clone Hero! Just kind of holding off for now because it's supposed to be better than Rock Band, so I already know it's going to be this whole "thing" for me once I get into it (trying to juggle a bunch of hobbies, as is my tendency lol).
Drumming! Buy an electronic kit, have tons of fun playing Rock Band, watch videos for technique, download a few practice books. You can at least play along with easy songs and it makes you feel badass! :D