Have:

XBLA Games:
Family Game Night: Scrabble
Puzzle Chronicles
Backbreaker Vengeance
Toy Soldiers: Cold War
Dungeon Defenders
Daytona USA
Space Channel 5 Part 2
BloodRayne: Betrayal

DLC:
Dragon Age: Awakening
Dragon Age: Blood Dragon Armor
Borderlands: The Secret Armory Of General Knoxx
DJ Hero: Tiesto Mix Pack
Vanquish: Tri-Weapon Pack
Fable III: Channeler Sword
Mortal Kombat: Online Pass
Assassin's Creed Brotherhood: Trajan Market (in-game, not sure if works)
Rock Band 2: Export Code
Band Hero: Export Code
Duke Nukem: Hail To The Icons pack
Batman Arkham City: Batman Beyond skin
Forza 4: Limited Collector's Edition DLC (1 code includes VIP, American Muscle, Launch Bonus, and BMW Design Challenge car packs)
Halo Reach: Legendary Edition DLC code (1 code includes Flaming Helmet, Elite Officer armor, Falcon prop, Recon Helmet)
Halo Reach: Recon Helmet
Alan Wake: The Signal
Kinect Joyride: Hammerhead, Apex, Sphinx, Eisenberg
Halo 4: Bulletproof emblem, Longbow theme


Avatar Stuff:
Assassin's Creed 2 Ezio Outfit (from Slurpee promo) (F)
CoD: Black Ops Flight Suit (M)
CoD: Black Ops R/C XD prop
Noble 6 Helmet
Soccer Ball
Spring Tree
Halo Energy Sword
Halo Banshee
Halo Master Chief Armor
Black Controller
Community Xperts Kinect Prop (same as Gamestop one?)
Carrot Plush Mascot
Foam Finger
Kinect Adventures Helicopter
Guinness World Record shirt
Forza 4 "I AM THE STIG" shirt
Halo 4 Ghost prop


Want:

Phantom Breaker: Battlegrounds
Halo 4 Maps
Pid
Double Dragon Neon
Shank 2
Xbox Live Gold codes (not 48h)
Spelunker HD
Tokyo Jungle

Only looking for the above (unlike my PSN thread post).
These are pretty much the only things I'm looking for at the moment, and I don't plan on trading XBLA codes for anything else... Just to save both you and me some time