This year it is pretty much only Super Smash Brothers Brawl that I'm looking forward to. Allthough I have it allready.
You guys should also try this addictive game called Audiosurf:
http://www.audio-surf.com/Basically the game let's you choose a song from your personal files, and it creates a track that follows the tempo and rhythm of the song. In slow parts of songs it goes slowly upwards, but when the song speeds up you fly downhill.
There are lots of different game modes, but the most enjoyable one is Ninja Mono, where you basically avoid grey blocks, and try to get all the coloured ones.
It's difficult to explain, but you can try a demo on that page. The real game only costs 10$ through steam.