Not sure which forum to post this, but I have a couple codes that may be of use to others that I have no use for. If you need or want one of them, simply post here and its yours, check your PM. These are all for Xbox 360. First come, first serve.
Alan Wake 1st DLC code (goes live sometime in July I think?) <--TAKEN
Gears of War 2 Flashback map pack <--- GONE
Halo Wars Honor Guard Tank <--GONE
48 hour code x 3 (they may or may not be expired, don't know) <-- NO MORE
As far as I remember, none of these have been redeemed, and they should all work. But if they work, great. If not... my apologies, but at least it was free. :-)
EDIT: ALL GONE!!!!