Airfoil

I have an Airport Express with airtunes. It's a wireless router, that has an audio connection that you can use to stream audio from iTunes to your stereo. Unfortunately the way it's designed you can only use iTunes to send music to the Airport Express.

I've been trying for a while to figure out a way to stream RealAudio to the Airport, so that I can listen to KVRX during the day when they only broadcast over the net. Airfoil is an app I found today that will let you broadcast audio from any application on your Mac to your Airport. If you have an Airport Express, it opens up a lot more options for what you can stream to your stereo.