XBMC, the very popular open-source media center software, has been successfully ported to Android. The folks at XBMC tell us this on their blog -
Today we announce XBMC for Android. Not a remote, not a thin client; the real deal. No root or jailbreak required. XBMC can be launched as an application on your set-top-box, tablet, phone, or wherever else Android may be found.