Steam, as defined by Wikipedia, is a digital distribution, digital rights management, multiplayer and communications platform developed by Valve Corporation, but you already knew that if you are a gamer.
Up until now Steam didn’t have a stand-alone official solution for accessing the offering from your mobile device. Now you can head over to the Android Market or follow the source link below and grab Steam for Android. You will be able to check things with the help of tabs like Summary, Friends, Groups, Games, Specials and Favorites.
Edit: As Wheezle points out in the comments (thanks), this unfortunately is still not the official version.