Did anyone ever answer this? here's what I found. Don't know if it works though.

Play Satellite Radio Through iTunes
Filed under: Way Cool —
Yes! You can play Sirius or XM through your computer. Here’s how:

1. Be sure that iTunes is installed on your computer. (Duh!)

2. You must have an Airport card in your computer.

3. You must have an Airport Express for each set of remote (powered) speakers.

4. Download Airfoil for Mac or Windows. Airfoil costs $25. There’s a full-function demo.

With Airfoil, you can send audio from…

RealPlayer, Windows Media Player, QuickTime Player, and other media players to the AirPort Express.

Pandora, Last.fm, and other web-based applications to the AirPort Express.

audio devices like the RadioSHARK to the AirPort Express.

Dashboard widgets, such as RadioTuner and RabbitRadio to the AirPort Express.

With Airfoil, you can send audio from almost any application to the AirPort Express.

5. To play Sirius or XM satellite radio through iTunes, plug the audio output from the satellite radio receiver into the audio input on the computer.

6. Bingo! You can now listen to satellite radio anywhere in the house where you have placed external (powered) speakers that are connected to an Airport Express.

7. Airfoil will drive about five sets of external, powered speakers. From the control panel, you can choose which speakers in the house you want to activate.

8. Yes, if you don’t want to hook up external speakers, you can listen to XM or Sirius through the speakers on your computer.

It’s Way Cool to have your favorite broadcast playing all through the house during the day.

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