Steam, the popular online service for distributing video games has been out for several years, but has not tapped into the mobile market yet, so fans and third parties are creating their own apps.
Steam for Android is developed by IBF Programs and allows Android users to browse game sales, get a summary of their Steam profile, keep up with friends and groups from the website, and view stats for all the games they play.
Kudos to the developers on the interface, which is very reminiscent of the recently released Android 4.0 operating system (Ice Cream Sandwich); it's easy to keep track of everything and interact with your existing Steam community. Speaking of which, if you don't already have a Steam player ID you'll want to grab that first as you really can't do much with the app without it.
If you spend a lot of time discussing games on Steam this should be a handy app, but if you don't care about the community and just want to play you can safely skip it. iOS users can use the third-party app Gears.
Steam for Android is a free download from the Android Market.