The Humble Store has a set of daily deals going on right now that I hope you'll see before it's too late. Most notably, there's Fez for $3.99. If not for the sense of discovery or lovely pixel art, do it for Disasterpeace's sublime soundtrack (you've heard Side F and Side Z, right?).
I've also got to give shout-outs to the 2D god game Reus ($3.39) and the excellent co-op brawler Guacamelee! Gold Edition ($7.49). Some fine games these are.
I'm sure it's been said before, but I do quite like how the Humble Store shows a hard number for the amount of money raised for charity -- $130,000 and counting. It feels good to be a gamer.