I've been enjoying Rock Band on the 360 a whole lot. Been a great motivator to have friends over to get drunk and bang on some drums. Plus the feeling of success when the band makes it through a tricky tone is quite enjoyable.

Aside from that, and as it relates to your thread, I'd recommend checking out Skate for anyone who's enjoyed skateboarding games in the past. They made some revolutionary changes to character control which makes the genre interesting again. In fact, from what I've heard, the Tony Hawk games had to go back to the drawing board to incorporate it.