I had a friend back in the day who just loved listening to his police scanner. Tashanna let me know about this new public beta of BBScanner which lets you listen to police and fire scanners on your BlackBerry. The app is free during the beta but I am not sure if it will remain that way. It looks like the app is using free feeds from RadioReference provided by volunteers so not all areas are covered.
The idea is pretty cool and I can imagine some ambulance chasing lawyers listening on their BlackBerrys… The audio is streamed through the BlackBerry Music Player so I think the app is just an easy to use catalog of available streams.