In addition to the included CR200 controller (left), the Sonos system can also be controlled via any iPhone or iPod Touch (the app is a free download from the iTunes Store). Shown in the background is the Desktop Controller software, which also allows control from any Windows PC or Mac.
The touch-screen interface of the CR200 is very similar to that of the iPod Touch/iPhone, though its full VGA (480x640) is actually double that of the Apple devices. Unlike the earlier scrollwheel-style Sonos CR100 controller, this one's got a removable, rechargeable battery.
This ZonePlayer includes a built-in amplifier, so all you need to do is provide a pair of speakers (not the red and black binding posts). Expand your Sonos system into additional rooms by purchasing additional ZP120s ($500 each).
The biggest caveat of the Sonos system is that one of the ZonePlayers needs a wired network connection. If you don't have a nearby Ethernet port, the easy workaround is the Sonos ZoneBridge BR100. Connect it to the wired network in the back room, and then it'll wirelessly communicate with the other ZonePlayers in the house (assuming, of course, that they're within range).
At $1,000, the Sonos system isn't cheap. But it provides access to a full panoply of digital music from your home network and the Internet (Pandora, Rhapsody, Last.fm, Napster, Sirius, and thousands of free Internet radio stations) all of which is accessible via a touch-screen controller that even novices will find easy to use.