I already own a lot of what has been mentioned here; Tribes, Terraria, Half Life, Braid, Borderlands etc etc. As lazy as it is, I accepted the offer of the one who actively seeked me out on steam and offered me a couple of codes.
So now I have a spare SMNC code, heh.
Trade for a Diablo 3 or Firefall? :P
Hah. I kid...
Unless someone actually wants to...
Sorry to all who posted and never got!