In a blog post today, RIM announced that it will begin seeding a new application, dubbed BlackBerry Radio, to select Beta Zone users in the United States. The goal of BlackBerry Radio is to make streaming internet radio stations, from multiple sources, easier to discover. That application pulls stations from popular online services like Slacker and iheartradio, as well as terrestrial sources like Clear Channel and Corus. Users can organize stations by genre and get links to purchase playing-songs directly from Amazon MP3. The application is free for Beta Zone users to test; interested parties can can sign up for BlackBerry’s Beta Zone here.