The latest copy of the Official Playstation magazine has a demo of Guitar Hero 2 on it. I picked up a copy today and can't wait to get home and give it a run. =D
You gotta play YYZ on co-op, kub. It's awesome. Especially if you can both handle (at least) hard. Hard mode on Guitar Hero 2 is like Expert mode in Guitar Hero 1. Expert mode now is waaaay harder on the later songs. On the other hand, hammer-ons and pull-offs are so much easier to do now that it balances out a little.