Steam's Big Picture mode, a full-screen interface with controller support, has left beta and entered the top-right corner of your client. To use it as intended, I'd have to run an exceptionally long HDMI cable from my bedroom to my TV and use a wireless controller, but I'm starting to think a mid-range PC in a small case might look real nice in my living room. In the meantime, I'll just use it to launch Peggle from bed.
Along with the launch, the Steam store has been overrun with "controller-friendly" deals. I'm distressed by the inclusion of Left 4 Dead 2 and Counter-Strike: Global Offensive in the list—just because they can be played with a controller doesn't mean they should be—but my typical WASD elitism aside, a sale is a sale. Mark of the Ninja seems more appropriate to me, and I've been enjoying it a ton. At least, I was, until PlanetSide 2 happened, but I'll go back once this match is over. It does end, right?