Airplay is a very cool technology, but it's limited to the second generation Apple TV and a few receivers. Sonos, as I reported last week, has come up with its own way to integrate AirPlay into a multi-room music system, and the company was nice enough to lend me an Apple Airport Express to try it out.
Since I already had a Sonos music system, the Airport Express was the only missing piece. You plug Airport Express in, connect it to one of your Sonos Zone
