Valve announced that its Steam Autumn Sale is on now, kicking off the holiday season with huge savings on catalog discounts and daily deals beginning with Portal 2 (66% off), Call of Duty: Black Ops (50% off), Mass Effect 2 (75% off), Duke Nukem Forever (66% off), and more.

Designed for players who love to craft the hundreds of different spells available in Magicka, this new campaign will pit up to four wizards at once against a horror-mystery inspired by the popular Cthulhu Mythos.

Previously an Unreal Development Kit project, Dungeon Defenders throws action-RPG and tower defense gameplay into the proverbial blender to create a seamless mix of leveling, looting and high-action territorial combat for casual and core players alike.

A white-knuckle blend of action and strategy, Orcs Must Die! challenges players to defend fortresses under siege.

Dead Island is a FPP shooter that combines elements of the survival horror genre and adventure games. The game tells the story of a couple being tossed ashore onto the sandy beaches of a desolate, zombie infested, island.

Valve announced the official launch of Steam Trading, which was in beta a few weeks ago, allowing gamers to exchange in-game items and game gifts.

Call of Duty: Modern Warfare 3 is a continuation of the previous title in the franchise, sending you all around the globe on high-risk missions as a variety of characters, both new and returning.

Red Orchestra 2 is a sequel to Tripwire's realism-based multiplayer WWII shooter. The game will focus on one of the most brutal battles in all of human history, the Battle of Stalingrad and the surrounding operations, both German and Russian, from July 1942 to Feb. 1943.

MicroVolts is an online shooter that offers an innovative 3rd Person approach over the traditional FPS, making it easier to play and more fun to watch while offering extra excitement and intensity.

With an all-new pirate-based theme, Risen 2: Dark Waters aims to combine the most loved classic RPG gameplay mechanics of the original Risen with a fresh theme and setting on a huge variety of themed island locales.

InMomentum is a minimalistic / sci-fi platform racing game that challenges the players to think in both horizontal and vertical perspectives while racing each other or against the clock in a puzzle-like environment.

Delivering content is really at the core of Steam, and we have been working on improving that core. As of today, you can download some of the content on Steam using all-new server and client code to get the job done.

Valve introduced support for Free to Play (F2P) Games on Steam with the launch of five F2P games, Spiral Knights, Forsaken Worlds, Champions Online: Free for All, Global Agenda: Free Agent, and Alliance of Valliant Arms (AVA).

In Deus Ex: Human Revolution you play Adam Jensen, a security specialist, handpicked to oversee the defense of one of America's most experimental biotechnology firms. But when a black ops team breaks in and kills the scientists you were hired to protect, everything you thought you knew about your job changes.

Fortix 2 can be described as reverse turret defense where players take control of Sir Fortix, whose aim is to conquer 35 castles in order to liberate the land of Artalom from the curse of evil mage, Xitrof.

In Fable III, you will be called upon to rally and fight alongside your people, ascend to the seat of power, and experience the true meaning of love and loss.

Portal 2 is a stand-alone, full-price retail release with new gameplay mechanics, story line, and some surprising new twists.

Brink is an immersive shooter that blends single-player, co-op, and multiplayer gameplay into one seamless experience, allowing you to develop your character across all modes of play. You decide the role you want to assume in the world of Brink as you fight to save yourself and mankind's last refuge for humanity.

Dungeon Siege 3 will bring together the beloved aspects of the Dungeon Siege franchise with Obsidian Entertainment's expertise, to create an evolved action-RPG experience. In addition to its arrival on high-def consoles for the first time, the game will also feature an all-new co-op multiplayer mode.

Lead and Gold: Gangs of the Wild West catapults the player straight into the dramatic crescendo of the Western myth. Allowing players to relive the thrills of a gunfight in classic western settings such as the main street of a frontier town or the claustrophobic depths of a gold mine.

Valve disclosed its plans for a new "big picture" mode of Steam which will offer controller support and navigation designed for television interaction, enabling gamers to enjoy their library of Steam games on more screens throughout the house.

Total War: Shogun 2 will take long-time veterans and newcomers alike to the next level of strategy gaming. Based on 10 years of experience in making Total War, Shogun 2 is the perfection of the series with a new Artificial Intelligence (AI), revolutionary multiplayer modes, brand new campaign map options and epic 3D real-time battles.

WH40k: Dawn of War II takes players to the brutal frontlines of war where they’ll experience intense action and visceral combat through a non-linear single player experience and a fully co-op campaign. Warhammer 40,000: Dawn of War II – Retribution  adds a multiple-race single player campaign, new multiplayer units, maps and an entire new playable faction.

As per the Research & Analysis division of analyst firm Forecasting and Analyzing Digital Entertainment, Valve's PC distribution platform garnered strong sales, estimated just shy $1 billion USD through the end of the year.