Steam had a huge 2011, 100% sales growth, 5 million simultaneous users during Holiday Sale

Valve just released their 2011 growth data for Steam, and during 2011 the platform grew to offer over 1,800 games to more than 40 million accounts. Year-over-year unit sales increased by more than 100-percent for the seventh straight year, and during the 2011 Holiday Sale, Steam's simultaneous user numbers ballooned to over 5 million players at once.

If you're a storage fan, get this: Steam doubled the amount of content delivered from 2010, to serve over 780 Petabytes (with a P!) of data to gamers around the world. To sustain this demand for bandwidth, the Steam infrastructure more than doubled its service capacity and a new content delivery architecture was deployed to improve user download rates.

Steamworks-powered games hit 14.5 million copies registered in 2011, a 67-percent increase over 2010. Included Steamworks titles were huge sellers like The Elder Scrolls V: Skyrim, Call of Duty: Modern Warfare 3, Deus Ex: Human Revolution, and more. Since Steamworks started over three years ago, it has shipped in over 400 games. Gabe Newell, co-founder, president of Valve and my personal super hero, says:

Steam and Steamworks continues to evolve to keep up with customer and developer demands for new services and content. Support for in-game item trading prompted the exchange of over 19 million items. Support for Free to Play (FTP) games, launched in June, has spurred the launch of 18 FTP titles on Steam, with more coming in 2012. Looking forward, we are preparing for the launch of the Big Picture UI mode, which will allow gamers to experience Steam on large displays and in more rooms of the house.