Mass Effect is a sci-fi adventure set in a vast universe filled with dangerous alien life forms and mysterious uncharted planets. In ME2, Saren's evil army of Geth soldiers has just been defeated, and humans, who are still struggling to make their mark on the galactic stage, are now faced with an even greater peril. Pre-order on Steam and get the Inferno In-Game Armor as reward.

The Steam Holiday Sale is on now through Sunday, January 3, 2010. This year's sale has begun earlier than years past so gamers can save big on last-minute shopping via Steam's Gifting functionality. Gamers can save up to 80% on select titles, with daily and week-long specials running during the promotion. Entire publisher catalogs, like Ubisoft, Rockstar, Take Two, Eidos, Codemasters, are anywhere between 25% to 80% off.

A fast, frantic and mega-bloodbath first-person shooter, Dreamkiller takes gamers inside the dark and twisted nightmares of tortured souls possessed by unknown forces. Dreamkiller is now available on Steam to play for free for the weekend and you can also purchase it for 25% off until Monday!

The Steam Early Holiday has begun, featuring a daily line-up of select games at deep discounts for just one day each. The Early Holiday Sale continues today with eight great deals: Dawn of Discovery (30% off), Quantz (80% off), The Secret of Monkey Island: SE (75% off), Call of Juarez: Bound in Blood (30% off), The Chronicles of Riddick: Assault on Dark Athena (50% off), Mirror's Edge (75% off), Section 8 (50% off), and Evil Genius (75% off)

The Steam Early Holiday has begun, featuring a daily line-up of select games at deep discounts for just one day each. The Early Holiday Sale starts  today with seven great deals: Batman: Arkham Asylum, Fallen Earth, Far Cry 2 and Champions Online are 50% off, Dragon Age: Origins 25% off, while GRID is 75% cheaper. On Friday at 8am PST and each day through Monday there will be a new line-up of deals.

Modern Warfare 2 continues the gripping and heart-racing saga with an unprecedented level of action as players face off against a new threat dedicated to bringing the world to the brink of collapse. Activision has issued a minor patch for MW2 on Steam, improving IWNet matchmaking

Waraming.net announced that its Massive Assault strategy game series is coming to Vavle's digital delivery platform. Massive Assault, Massive Assault: Phantom Renaissance and Massive Assault Network 2 are now available on Steam giving its users the unique chance to fight for global domination in one-of-a-kind sci-fi environment.

L4D2 promises to set a new benchmark for cooperative action games, adding melee combat to enable deeper cooperative gameplay, with items such as a chainsaw, frying pan, axe, baseball bat, and more. After being delayed for a day, the L4D2 PC demo is now available on Steam, only for fans who pre-ordered the game though.

L4D2 promises to set a new benchmark for cooperative action games, adding melee combat to enable deeper cooperative gameplay, with items such as a chainsaw, frying pan, axe, baseball bat, and more.

Modern Warfare 2 continues the gripping and heart-racing saga with an unprecedented level of action as players face off against a new threat dedicated to bringing the world to the brink of collapse.

Killing Floor is a first-person co-op survival horror, set in and around London after a mad scientist’s “specimens” have broken loose and gone on the rampage. On Oct. 22 Tripwire will release the “Level Up” Free Content pack, and to celebrate Killing Floor will be available for free on Steam from Oct. 22nd through October 25th.

In Painkiller: Resurrection you play as an ex CIA Agent and Black Ops Special Unit who has a big problem: during his last job, he has managed to not only kill the head of an illegal drug operation and a slew of innocent civilians, but himself in a fatal mistake. JoWood is offering its back catalog as digital download through Steam, which now offers Painkiller: Resurrection as pre-order throwing in the previous three games in the series for free.

A host of THQ titles are available at special prices this week on Steam. For the 3rd day, all games in the Dawn of War series (original, 2 expansions and Dawn of War II) are available at 50% off their regular price. In addition, the Civ IV Complete pack (includes Civ IV, Warlords and Beyond the Sword expansions, and Civ IV: Colonization) is on sale for $19.99.

Killing Floor is a first-person co-op survival horror, set in and around London after a mad scientist’s “specimens” have broken loose and gone on the rampage. On Oct. 22 Tripwire will release the “Level Up” Free Content pack, and to celebrate Killing Floor will be available for free on Steam from Oct. 22nd through October 25th.

Torchlight is an adventure-themed action-MMORPG which emphasizes a simple and intuitive interface, fast and furious action, and a colorful and compelling game world.

A host of THQ titles are available at special prices this week on Steam. For the first day, all games in the Titan Quest series are available at 50% off their regular price. Check back each day for a new deal.  In addition, the THQ Collector Pack -- featuring titles from the Company of Heroes, Titan Quest, and Warhamner 40,000: Dawn of War series -- is available for 10% off its regular price for the duration of the sale.

Metal Drift is a vehicular sport combat game set in a distant future. You command an agile, high powered hover tank in a futuristic sports arena. Core game play centers on intense tank-on-tank multiplayer team combat seen through an immersive, first person cockpit.

Valve announced that six more EA games are available now on Steam, its digitial distribution network, being: Need for Speed: SHIFT, Battlefield 2: Complete Collection, Medal of Honor: Airborne, Godfather, Godfather 2, and Command & Conquer: Red Alert 3: Uprising.

Borderlands is an all-new sci-fi action game combining elements of first-person action titles with player customization and vehicular combat. Borderlands will be available through Steam and adds the ability to export equipment cards as JPEGs, and includes timed demo benchmark software. Fans who pre-order Borderlands from Steam will save 10% off the regular price.

Cities XL expands upon all that make city builders fun and interesting, with cities that are bigger, more realistic and sophisticated than ever before, while letting you take your game online, and interact with others in a massive online environment.

Borderlands is an all-new sci-fi action game combining elements of first-person action titles with player customization and vehicular combat. Borderlands will be available through Steam and adds the ability to export equipment cards as JPEGs, and includes timed demo benchmark software. Fans who pre-order at Gamestop get the Mercenary Weapon Pack which includes 8 unique in-game guns.

Fallen Earth is a post-apocalyptic massively multiplayer online game that mixes FPS style with traditional RPG mechanics, where six factions are struggling to emerge from the collapse of civilization brought on by viruses and environmental disaster.

Last week LucasArts revealed that it would be re-releasing its classic Jedi Knight titles as digital downloads, and today both Steam and Direct2Drive are offering bundles. Over at Steam you can get Mysteries of the Sith, Dark Forces, Dark Forces II, Jedi Academy, and Jedi Knight II: Jedi Outcast separately, or bundled for $19.99 total. Direct2Drive is offering Dark Forces, Jedi Academy and Jedi Knight II: Jedi Outcast for $14.95 total.

Madballs...in Babo: Invasion is a gameplay rich, feature laden 'casually hardcore' arena based 3D action shooter, where you're able to design your own combat maps by placing a combination of map tiles to create a never before seen map before gameplay starts.

This weekend only, Valve is offering the THQ Collector Pack at 25% off its regular price on Steam, which includes a total of 13 titles such as Dawn of War II, S.T.A.L.K.E.R., Titan Quest, and Company of Heroes.