As of last night, I can announce it is possible for the coolest thing ever to get even cooler.
Sonos upgraded their software; I downloaded it last night. The system now loads local radio stations into the system based on my location (which I can change), and there are more than 10,000 stations and shows.
Sonos is, without a doubt, the single best purchase I've ever made, and the favorite thing I own. If you love music and want it everywhere in your house, this is an investment you must make.