Steam Holiday "Hidden Deals":
90% off:
Bad Rats: the Rats' Revenge ($0.49, horrible game but something badass to gift nevertheless)
Ignite ($0.99)
Perimeter 2: New Earth ($1.49)
Puzzle Kingdoms ($1.49)
Toki Tori ($0.49)
Zeno Clash ($0.99)
85% off:
Dangerous Waters ($2.24)
Ghost Master ($0.74)
80% off:
Broken Sword Trilogy ($1.99, separate games also 80% off)
Commandos Collection ($2.99, separate games also 80% off)
Jack Keane ($1.99)
Jagged Alliance 2 Gold ($3.99)
Nation Red ($1.99)
Naval Warfare ($0.99)
75% off:
AaAaAA!!! - A Reckless Disregard for Gravity ($2.49)
AaaaaAAaaaAAAaaAAAAaAAAAA!!! for the Awesome ($2.49)
Airline Tycoon 2 ($4.99, includes DLC)
Audiosurf ($2.49)
The Baconing ($3.74, includes DLC)
Bang Bang Racing ($2.49)
Blades of Time ($6.24)
Blocks That Matter ($1.24)
Botanicula ($2.49)
Cargo Commander ($2.49)
Cities XL Regular Edition ($3.24, Limited Edition also 75% off)
City Life 2008 ($2.49)
Critter Crunch ($1.74)
Dawn of War Franchise Pack ($19.99, separate games and DLC 50-51% off)
Drakensang - The River of Time ($4.99, includes DLC)
Dungeons of Dredmor ($2.49, includes DLC)
E.Y.E.: Divine Cybermancy ($2.49)
Edna & Harvey: Harvey's New Eyes ($4.99)
English Country Tune ($1.24)
Faerie Solitaire ($1.24)
Game of Thrones Bundle ($17.49, separate games 50-75% off)
Garshasp: Temple of the Dragon ($1.24)
Gatling Gears ($2.49)
Hacker Complete Bundle ($7.49, separate games and DLC 50-75% off)
Hard Reset: Extended Edition ($3.74)
The Haunted: Hells Reach ($4.99)
Hydrophobia: Prophecy ($1.24)
Kung Fu Strike ($2.49, includes DLC)
Legendary ($1.24)
Loki ($2.49)
Magic: The Gathering - Duels of the Planeswalkers 2012 ($4.99, including expansion and DLC, can't be sold separately)
Magnetis ($0.49)
Meridian4 Collection ($19.99, separate games also 75% off)
Nimbus ($2.49)
Pendulo Adventure Pack ($14.99, separate games also 75% off)
Pro Cycling Manager - Le Tour de France 2008 ($2.49)
Q.U.B.E. ($3.74)
Rock of Ages ($2.39)
Rocketbirds: Hardboiled Chicken ($2.49)
Robin Hood: The Legend of Sherwood ($2.49)
Roller Coaster Rampage ($2.49)
S.T.A.L.K.E.R.: Call of Pripyat ($3.74)
S.T.A.L.K.E.R.: Clear Sky ($2.49)
Scoregasm ($2.49)
Section 8 ($1.24)
Serious Sam Franchise ($23.74, separate games and DLC also 75% off)
Sequence ($1.24)
Shattered Horizon ($2.49, does not support DirectX 9 nor Win XP)
The Sherlock Holmes Collection ($8.74, separate games also 75% off)
Sideway New York ($2.49)
Silverfall Complete ($3.74, separate games also 75% off)
SkyDrift ($2.49, includes DLC)
Sol Survivor ($2.49)
Space Pirates and Zombies ($3.40)
Sprint Cars Road to Knoxville ($2.49)
Stellar Impact ($2.49, includes DLC)
Tales from Space: Mutant Blobs Attack ($1.99)
Time Gentlemen, Please! and Ben There, Dan That! Special Edition Double Pack ($1.24)
Turba ($1.24)
Unstoppable Gorg ($2.49)
Velvet Assassin ($1.24)
Who's That Flying?! ($1.49)
The Witcher: Enhanced Edition Director's Cut ($2.49, you can redeem it on GOG for more extras and a DRM-free copy)
World of Goo ($2.49)
70% off:
Flatout Complete Pack ($11.99, separate games 60-80% off)
Ninja Blade ($5.99)
RACE 07 ($0.89, includes expansions)
66% off:
Defender's Quest: Valley of the Forgotten ($5.10)
Deponia ($6.79)
Devil May Cry 3 Special Edition ($6.79)
Devil May Cry 4 ($6.79)
Luxor Collection ($13.59, separate games also 66% off)
Sine Mora ($3.39)
Wanderlust: Rebirth ($3.49)
Wizorb ($1.01)
Worms Complete Pack ($27.19, separate games and DLC also 66% off)
60% off:
Noitu Love 2: Devolution ($1.99)
Penny Arcade's On the Rain-Slick Precipice of Darkness 3 ($2)
Winter Voices ($1.99 per episode)
The Witcher 2: Assassins of Kings Enhanced Edition ($11.99, you can redeem it on GOG for extras and a DRM-free copy)
50% off:
Alan Wake Franchise ($19.99, separate games and DLC also 50% off)
The Blackwell Bundle ($9.99, separate games also 50% off)
Chaos on Deponia ($9.99)
The Dark Eye: Chains of Satinav ($9.99)
Ether Vapor Remaster ($3.99)
eXceed Complete Pack ($4.99, separate games 0-50% off)
Fractal: Make Blooms Not War ($3.49)
L.A. Noire ($9.99, includes DLC)
Legacy of Kain Collection ($12.49, separate games also 50% off)
Mafia II ($14.99, includes DLC)
Ravaged ($4.99)
Resident Evil 5 ($9.99)
Rocket Knight ($7.49)
S.T.A.L.K.E.R.: Shadow of Chernobyl ($9.99)
Saints Row: The Third ($19.99, includes DLC)
Satazius ($2.99)
Tomb Raider Collection ($29.99, separate games 40-50% off)
40% off:
Half Minute Hero: Super Mega Neo Climax Ultimate Boy ($5.99)
33% off:
Dead Pixels ($1.99)