Can I get through the day without buying anything new on Steam? We'll see. Today's daily deals aren't terribly compelling to me, but that is far from indicative of the quality of the discounted titles. There's some good stuff in here, absolutely. And there's the potential for either Bastion or Awesomenauts to go super cheap in the community's choice poll.
For those only now getting around to picking up Dark Souls on PC, be sure to grab DSfix. It'll make the game look far better than it has any right to and setting up the mod is painless. Batman and Deus Ex at those prices are worth downloading and Gunpoint is also worth considering.