Mass Effect 2 is SO AWESOME.
Oh and Super Meat Boy is awesome.
To all of you that haven't gotten VVVVVV yet, shame on you.
Torchlight is a fun dungeon crawler, Deathspank is just about as fun as Torchlight with excellent humor.
Beat Hazard is a great game, but not for us perfectionists. I can't stand dying on any of my songs, so I end up hair pulling after I retry the level for the one hundredth time.
Audio Surf is less rage based then Beat Hazard.
Serious Sam HD The first encounter and second encounter are great games for fans of Gore, Enemy spam, awesome graphics, and secret hunting.
Diamond Dan is a great game too.