One lucky winner gets the Sonos ZonePlayer S5, an all-in-one wireless music system controlled by an iPhone, iPod touch, or any Sonos Controller. Yes, it wirelessly plays music from the Internet and your iTunes collection in any room. It’s a $399 value. This is what it looks like (though, of course, the iPhone is not included):

Here it is in a kitchen that’s nicer than ours:

A few key features:

• Room-filling sound: 5 integrated speakers and 5 dedicated digital amplifiers provide crystal-clear, great-sounding audio that fills any room with music
• Unlimited music from iTunes and the Internet: Play way more than what fits on your iPod, including all your iTunes, free Internet radio and millions of songs and stations from the Internet.
• Control with an iPhone or iPod touch: Download the free Sonos Controller for iPhone app and search for songs, choose the music and control the volume in any room from anywhere.
• Wireless expandability: Add more S5s wirelessly and fill your whole house with music.

You’ll find a demo here and there are plenty of technical specifications at Sonos.

CONTEST ENDS 12/16/09 AT 12PM EST.