one of the following for 6 keys:
Sins of a Solar Empire: Rebellion, Warhammer 40,000: Dawn of War II - Complete Pack (Dawn of War II + Dawn of War II Chaos Rising + Dawn of War II: Retribution)
one of the following for 5 keys:
Batman: Arkham City - GOTY, Borderlands GOTY, Dead Space 2, Alice: Madness Returns
one of the following for 4 keys:
Asssassin's Creed: Brotherhood Deluxe Edition, Left 4 Dead 2, The Elder Scroll IV: Oblivion, Risen, Deus Ex: Human Revolution, Batman: Arkham Asylum GOTY, Battlefield: Bad Company 2, Sid Meier's Civilization V: GOTY
one of the following for 3 keys:
S.T.A.L.K.E.R.: Shadow of Chernobyl, Mirror's Edge, Section8: Prejudice + All DLCs, Just Cause 2, Dawn of War II Chaos Rising
one of the following for 2 keys:
Far Cry 2, X3: Reunion, Star Wars: Knights of the Old Republic, Star Wars: Knights of the Old Republic II, The Witcher: EE, Men of War, Men of War: Red Tide, Magicka, Machinarium, Rome: Total War, AI War: Fleet Command, Red Faction: Armaggedon, A Valley Without Wind 1 and 2 Dual Pack, Deus Ex: GOTY, Frozen Synapse
one of the following for 1 key:
Velvet Assassin, Toki Tori, The Ship - 2 Pack Gift (includes 2 copies of The Ship Complete)
all are tradable steam gifts.
I might be getting some keys soon, (Not sure just how many yet) and I was just seeing what I could get out of them.