Steam have got loads of games (over 120)on sale this weekend from 10% (mainly pre-orders to 90% (Alpha Protocol). you can check them all out via the Specials tab on the main Steam page which can be found HERE. I've not bothered listing percentages or prices. you can find those over on Steam:
Here's the games list.
Two Worlds II
Total War: SHOGUN 2 - Sengoku Jidai Unit Pack
Total War Mega Pack
Total War: SHOGUN 2
Lucid
Company of Heroes
Company of Heroes Complete Pack
Company of Heroes: Opposing Fronts
Company of Heroes: Tales of Valor
Company of Heroes: Gold
Alpha Protocol
Super Thunder Blade
Rome: Total War - Gold
Sword of Vermilion
Shinobi III: Return of the Ninja Master
The Club
Shadow Dancer
Virtua Fighter 2
Vectorman
SEGA Mega Drive Classics Pack
Total War: SHOGUN 2 - The Ikko Ikki Clan Pack
Sonic the Hedgehog
Sonic & SEGA All-Stars Racing
Sonic Spinball
Space Harrier II
SEGA Genesis Classics Pack
Vancouver 2010 - The Official Video Game of the...
Virtua Tennis 4
Medieval II Complete Pack
SEGA Genesis Classics Pack 3
SEGA Mega Drive Classics Pack 2
SEGA Mega Drive Classics Pack 3
Streets of Rage 2
Streets of Rage
Space Channel 5: Part 2
SEGA Mega Drive Classics Pack 4
Sonic the Hedgehog 2
Sega Collector Pack
Wonder Boy III: Monster Lair
Sonic Adventure DX
Sonic 3 and Knuckles
Shining in the Darkness
Shining Force II
Sonic 3D Blast
SEGA Genesis Classics Pack 2
SEGA Bass Fishing
SEGA Genesis Classics Pack 4
Stormrise
Virtua Tennis 2009
Universe at War: Earth Assault
Shining Force
Space Siege
Golden Axe
Galaxy Force II
ESWAT: City Under Siege
Golden Axe II
Eternal Champions
Fatal Labyrinth
Flicky
Gain Ground
Crazy Taxi
Landstalker: The Treasures of King Nole
Light Crusader
Gunstar Heroes
Dreamcast Collection
Ristar
Ecco: The Tides of Time
Kid Chameleon
Columns III
Medieval II Gold
Empire: Total War - Downloadable Content Pack
Napoleon: Total War - The Peninsular Campaign
Medieval II: Total War
Medieval II: Total War Kingdoms
Rome: Total War - Complete
Rome: Total War - Alexander
Napoleon: Total War - Coalition Battle Pack
Ecco Jr.
Empire: Total War
Napoleon: Total War Imperial Edition
Football Manager 2011
Empire: Total War - Elite Units of America
Empire: Total War - Elite Units of the West
Empire: Total War - Elite Units of the East
Empire & Napoleon Total War - Game of the Year...
Empire: Total War - The Warpath Campaign
Empire: Total War - Special Forces Units & Bonus...
Bio-Hazard Battle
Bonanza Bros.
Columns
Crack Down
Altered Beast
Decap Attack
Aliens vs. Predator
Ecco the Dolphin
Aliens vs. Predator Swarm Map Pack
Dr. Robotnik's Mean Bean Machine
Comix Zone
Alien Soldier
Aliens vs Predator Bughunt Map Pack
Alex Kidd in the Enchanted Castle
Alien Storm
The Witcher 2: Assassins of Kings Digital Premium...
Worms Ultimate Mayhem + Reloaded
F1 2011
HOARD
Bunch of Heroes
Two Worlds II - Pirates of the Flying Fortress
Sol Survivor
Revenge of the Titans
Anomaly: Warzone Earth
Demolition Inc.
Xotic
Deus Ex: Human Revolution
A Game of Thrones - Genesis
Dungeons - The Dark Lord
Digital Combat Simulator: Black Shark
DCS A-10C Warthog
The Haunted: Hells Reach
Serious Sam Classic: Second Encounter
Serious Sam Classic: First Encounter
Serious Sam 3: BFE
Nuclear Dawn
Dead Island