If you've got an Android 2.1 or above device, a beta copy of media software legend Winamp has your name on it. But this isn't the bare bones MP3 player you probably knew way back—the beta boasts sophisticated features.
Winamp on Android will, for instance, allow for wireless syncing with your computer's library, let you fully control it via widget, and offers scrobbling support for you Last.fm fans. [Winamp]