There are a number of separate Steam deals going on this weekend and with the big holiday sale seemingly not happening until at least mid-December, I ... oh. My money's already gone.
Ubisoft has discounted Call of Juarez: Gunslinger, and Far Cry 3: Blood Dragon to $7.49 each. The latter is easy to recommend at that price, and I seem to recall people quite liking the more arcade-y take on CoJ as well. Buy them bundled together for $12.49, if you want.
One of my favorite publishers, Devolver Digital, has a sale on the likes of Hotline Miami ($2.49), Shadow Warrior ($26.79), and everything Serious Sam ($14.24 for the Complete Pack). Then we get to Total War: Rome II, which is down to $44.96. Doesn't feel like as much of a discount when your game launches at a full $60.