For only today, id Software's latest game RAGE is 50% off on Steam. FOR ONLY TODAY, that's why it's called a daily deal after all. So if you've been interested in this shooter, now is the time to give it a try.
How I wish this deal was around before I bought my 360 copy of the game. Oh well, money well spent. The game is around 10- 14 hours long and the gameplay of this game is one of the best you'll ever experience in a shooter.