All tradable gifts:
Defiance - 4 keys
Darksiders II + Darksiders II - Season Pass - 6 keys
Command & Conquer: Tiberium Wars + Kane's Wrath - 4 keys
Sniper Ghost Warrior Gold Edition - 1 key
Alien Breed™ Trilogy(3 games: Alien Breed 2: Assault + Alien Breed 3: Descent + Alien Breed: Impact) - 2 keys
FlatOut: Ultimate Carnage - 2 keys
Alan Wake Franchise(Alan Wake's American Nightmare, Alan Wake, Alan Wake Collector's Edition Extras) - 3 keys
Painkiller: Hell and Damnation - 2 keys
Deus Ex: Human Revolution + Tactical Enhancement + Explosive Mission Bundle - 3 keys
Forge - 1 key
Warhammer 40,000: Space Marine - 4 keys
The Darkness II - 4 keys
Two Worlds II + Two Worlds II - Pirates of the Flying Fortress - 3 keys
Test Drive Unlimited 2 - 4 keys
Tropico 4 Collector's Bundle(+ all dlc) - 4 keys
DiRT 3 - 4 keys
Battlefield Bad Company 2 - 4 keys
Jurassic Park: The Game - 4 keys
Dungeon Siege Complete(all D.Siege games) - 3 keys
Binary Domain - 3 keys
Portal pack(Portal, Portal 2) - 4 keys
Endless Space - Emperor Edition - 4 keys
Mafia II - 4 keys
Saints Row: The Third - The Full Package - 4 keys
Flatout Complete Pack(FlatOut, FlatOut 2™, Flatout 3: Chaos & Destruction, FlatOut: Ultimate Carnage) - 4 keys
Dragon Age: Origins + Dragon Age™: Origins Awakening - 4 keys
Dead Island Riptide - 7 keys
Killing Floor - 2 keys
LEGO The Lord of the Rings - 4 keys
Serious Sam 3: BFE - 3 keys
Doom 3: BFG Edition - 4 keys
Dear Esther, Thomas Was Alone, Tiny & Big, English Country Tune, and Oil Rush for 1 key?
Humble Deep Silver Bundle BTA, Containing these: (Dead Island GOTY + Saints Row full DLC pack + Risen 1 + Metro 2033 + Sacred Citadel ) for 2 TF2 Keys.
yep