hmmm... If you figure that you have a network connection, then does there really need to be a separate plugin, or just a tweak to the Media module to support being able to pick links to a stream versus an MP3?
For example, you'd just need to launch the WMP core pointing to a stream, like this:
I suggested this in the RR forums, but I would like to see some sort of support for sirius internet radio, maybe even tied into the sat radio plugin. The 128kbps version sounds a lot better than when listening in my in car.