Halo 2 - looks good, I hope they polish the graphics more (what I saw on G4 looked almost as bad as the original Halo did... >_>)
Half-Life 2 - The physics will rule, the story will rule, and Half-Life's gameplay was top notch for the time, this'll be a winner for sure... hopefully.
Fable - If only you could have a female character. But quality over quantity I guess. Looking very very good.
Star Craft Ghost - I was looking forward to this game up untill they said it was turning into a first person shooter. Then I said screw it. Unless ghost is a stealth game, I dont want it. Ghosts by definition are stealth based characters and to turn them into hyper awesome combatants that gun stuff down changes more than the feel of the game, but the way "Starcraft" worked.
Lots of games comming out, hope I dont get too distracted.