Electric Pocket announced the availability of <A HREF="http://www.electricpocket.com/aboutus/press/pr040928.html">Ringo Pro for the Treo 600</A> smartphone from palmOne, featuring the new ability to play MP3 ringtones. Ringo enables Treo 600 users to establish customized ringtones for specific callers or groups of callers, and assign photographs for each caller or group.