www.apple.com/ipod/start

Steam is a digital distribution, digital rights management, multiplayer and communications platform developed by Valve. The software was first released in 2003 and as of January 2012 and it now features 1504 games and 40 million active user accounts. It is estimated that Steam has roughly a 70% share of the digital distribution market for video games.

With this free app you can see which of your Steam friends are online, chat with your buddies, and shop for Mac and Windows games.

It does bring up an interesting question, though. Maybe Valve, maker of hits like Half-Life and Portal as well as the owners of Steam, is interested in making games for mobile platforms. It’s certainly possible. We’ve seen that great first-person shooters can be made for iOS thanks to Rage HD. This probably isn’t Steam’s beginning for the mobile space, but it could signal Valve’s.