Now, it's nearing the end of the sale, but for those that haven't checked it out yet:
humble indie bundle
Many popular indie titles are available (VVVVVV, and Cogs, for example) for any price you wish to pay!
Pay over the average price, and you nab many other popular indie games (including Braid (!!!) and Machinarium), which is pretty special.
Also, while not a big deal, but anyone who purchases the bundle also gets access to Minecraft until Aug. 14th!
Also good to know that It's multiplatform (PC, Linux, Mac). DRM free, and proceeds can be distributed to charity.