Sonos does this--but doesn't require you to go through your computer. It does, however, require you to go through your router. It creates a proprietary wireless network between the BRIDGE (Sonos' router) and the speakers, which are wireless. The speakers do have to be plugged into a wall outlet, but can be configured any number of ways--for stereo or single speaker listening. There are two sizes/styles of speakers.
The system CAN go through computer and draw your playlists from iTunes, for instance, but it doesn't have to. It can play TuneIn Radio, Spotify, Pandora, iHeart radio, Stitcher, and Line-in from TV or other audio component. Controllers can be downloaded so it can be operated from computer, iphone, ipad (I supposed android as well), or you can buy a separate controller. You can play multiple sources on different speakers (iTunes in living room, and Pandora in the kitchen, for instance). Or, you can stream the same feed to all speakers. There is also a line out from a CONNECT (amp) that bridges multiple system component so you can play through headphones.
I'm somewhat new to the higher end audio game, hope all of the above is accurate and clear. I did find it a little difficult to understand what the system does and CAN do (pretty much everything!), but set up was fairly easy, and operation is pretty intuitive.
It is an expensive system, and there are probably others available for cheaper; however, for the ease of use and convenience, I personally found it to be worth the expense. Hope that helps.
Edited by drjman - 5/1/12 at 2:15pm