I need to finish moar of those 08 gaymes before I pass judgment, but here goes:
4) Little Big Planet: again, very jewnique. Loads of fun to play with others.
3) Dead Space: great storyline, amazing graphics, just an all-round good game.
2) Patapon: was very unique, innovative and completely addictive
1) GTA IV: fantastic game - lived up to expectations for me
Probably will add after playing: Gears of War 2, Fable 2, Fallout 3, Far Cry 2
NB: GTA IV isn't really my GOTY - need to play more of this year's titles first.