Initially it may not seem like a huge benefit, as the Sonos system will already stream all the music from your iTunes folder.  A few advantages present themselves immediately, like being able to turn your computer off and still streaming audio, or playing music from the phones of friends and family who come to visit.

You'll be able to pick up a Sonos Wireless Dock to go with your system at the beginning of October, when it will be available for $119.