When I was remodeling last year I looked at Sonos - but since I needed a new receiver anyways I decided to go a different route. I went with a Denon (3808CI) that does multi-room. This Denon connects to the network/internet so I can play any music from any computer connected to the net, internet radio, an iPod when connected, plus regular broadcast, XM, CD's, DVD's , etc - damn near anything.
I can play a different source in each room. It comes with remote controllers if you add the IR controls - which I didn't add but can. I have four rooms (everybody has different needs) that I connected: Living room, kitchen, rear deck and front deck. Adding external amps I could add more rooms by changing the amp assigns on the Denon.
In addition I can control the Denon from any computer connected to the net. As in if I'm in my basement office and my daughter is upstairs in the living room and I don't like what she is playing - or playing to loud - I can change the song or turn the damn thing down from here - makes for some good fun -
Haven't tried it yet - but I may be able to control it from my Treo phone also.
Anyway - just an idea - works very well for me - but you know - different needs.
Ron