Check out the Humble Bundle, a collection of indie games on sale for just a few days. You pay as much (or as little) as you want, and get to select who gets to benefit from your payment. Most of my contribution went to the EFF.

If anything I recommend getting it for Braid. It's an at-times fiendishly difficult puzzle game and it'll mess with your head, but there's a real sense of achievement when you figure something out.

Besides Braid there's Cortex Command (an unfinished game, but you get free updates for life), Machinarium, Revenge of the Titans and the iPad classic Osmos. All 5 included games are cross-platform and DRM-free! Pay what you want once and you can download versions for Windows, Mac and Linux.

Go go go!