UT2007 - even though it will play like a dog on my system...
Final Fantasy XII (which will probably enjoy a PS3 release in 2007, but nevermind)
HL2: Aftermath - cos we all know Alyx should be dead, might wanna see how they twist that around!
I definitely think that Alan Wake will be a sleeper hit if it lands in '06. I've already liked what i've seen from that game.