After reading this thread,http://www.blackberryforums.com/gene...ing-music.html
I became suspicious that the xm radio might be available for other BB's besides the 8300 -- like my pearl.
I navigated to the AT&T media net home page, searched for xm radio, clicked on the first link and installed it. Now I'm listening to some Journey on the '80s station. IMHO Journey sucks, but the XM streaming radio is cool.
EDIT: Here's the link: XM Radio Mobile
One issue I'm seeing is that it doesn't pause or stop the player when a phone call comes in -- instead the call gets kicked right to voicemail.