I have a Wii. I only really bought it for Zelda so any good games that come out after that are just bonuses. But Mario Kart/Party/Galaxy are all fun.
Right now I'm playing Fallout 3 for Xbox 360. Awesome game. I love all the choices you have and all the shit there is to explore. I've already got 50 hours and I can definitely see me logging in 100.
I'm also playing Skate on and off all the time. It's winter so I can't skate; this game gets me through haha.