In all honesty, I think it is a tie between the PS2 and Wii for me, but as the year progresses, I think I will be playing the Wii just a bit more than the PS2 for this year. PS2 has no new games that I am expecting to play either.
The Wii's control scheme is so fantastic when you feel the need to lie down and play a game casually no matter what game that may be. I always sit to the side of my TV and I can just lie there and use the Wii-mote just like if I was directly in front of the TV.
Concerning the X360, I tend to be very picky over the games that I play and the X360's game lineup just doesn't interest me that much this year for the most part. With the more recent games that I've played, I'm more addicted to gaining their Achievements than I am on actually completing the game for enjoyment. Not that that's bad, just noticeable.