At the last GG it turned out that some don’t know about Airfoil. Rogue Amoeba’s little software tool allows one to stream any audio playing on a Mac or Win computer to an Airport Express base station. We use this quite a bit in our office to listen to Pandora through our networked speakers. The features I like are “link to system volume” and the ability to playback the same signal through both on the host computer and the Express base station at the same time. Check it out at: http://rogueamoeba.com/airfoil/