It is probably well known that iTunes will broadcast to Airports on your network. It may not be as well known how to get such popular sites as Pandora and wolfgangsvault to do so. The key is an inexpensive program called Airfoil. It only needs to run on the broadcasting computer. A huge additional benefit is that other computers can run the free program Airfoil Speakers, "a free accompaniment to Airfoil." So in this frenetic 30 second video, you can first see and hear Devo's "Whip It" playing on Pandora on a Mac, then see and hear it being broadcast via Airport Express to speakers in the TV room, then see and hear it being broadcast via Airport Express to a Bose system in the living room, and finally being broadcast to a PC running Airfoil Speakers upstairs.