One of these for SF:
BETA:
DOTA Tradable Gift (region free)
GIFTS:
Alan Wake Franchise (Alan Wake CE + American Nightmare)
Alice Madness Returns
Borderlands GOTY
Burnout Ultimate Box
Command & Conquer 3 Tiberium Wars + Command & Conquer 3 Kane's Wrath
Darkness 2
Darkspore
Dead Space 1
Dead Space 2
Dungeon Defenders
Evil Genius
Fallout 3 GOTY
Galactic Civilizations 2 Ultimate Edition
Garry's Mod
Iron Brigade (new!)
Just Cause 2
Left 4 Dead 2
Men of War Assault Squad GOTY
Metro 2033
Nexuiz
Portal 2
Railworks 2012 Deluxe (update to RW2013 is automatic and free)
Risen
Rome Total War Complete (includes Alexander)
Saints Row 3
Spore Creepy and Cute Pack
Star Wars Knights of the Old Republic
Terraria
The Witcher Enhanced Edition
The Ship 2-pack (gives an extra gift copy on activation)
Titan's Quest Gold (2 games)
Torchlight
Trine Franchise (1+2)
Wargame European Escalation
Warhammer 40K Dawn of War Platinum (3 games)
Warhammer 40K Space Marine
STEAM KEYS:
Deus Ex: Human Revolution
Deus Ex: Human Revolution The Missing Link DLC
Hitman Blood Money
Just Cause
Just Cause 2
Quantum Conundrum
Supreme Commander 2
The Last Remnant
Chime
Commandos 3 Destination Berlin
Cortex Command
King's Bounty the Legend
Reign: Confict of Nations
Rig n' Roll
Space Rangers
Star Wolves
Theater of War 2: Africa 1943
The Void
HIB6 Gift Link (Vessel, Torchlight, Rochard, SPAZ, Shatter, Wizorb, BIT.TRIP.RUNNER, Gratuitous Space Battles, Jamestown)
HIB3 Android 3 Bonus key (World of Goo, Anomaly, Osmos, EDGE)
NON-STEAM KEYS:
CoH: Tales of Valor (works with Steam if you already have another CoH game to use the key with or off-Steam standalone)
ARMA 2
MISC:
Impreial Tricorne (SK item)
Medieval War Helm (SK item)
Golden Laurel (SK item)
Genuine Foppish Physician (TF2 item)
Genuine Distinguished Rogue (TF2 item)
Genuine King of Scotland Cape (TF2 item)
Genuine K-9 Mane (TF2 item)
Genuine Stovepipe Sniper Shako (TF2 item)
Steam Community Beta Access (tradable)
Airmech Beta + 1000 Diamonds (key)
Firefall Beta (key)
Loadout Beta (key)
As in title ^^