(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
The latest pay what you want deal is on Unstoppable Gorg at IndieGameStand.
Pay at least $1 and you get a Steam + Desura activation key for the game. If you beat the averge (currently $1.46) you will also receive the bonus game Steller Impact. That game also comes with Steam + Desura activation keys.