"Creatives Xmod Wireless streams music in Xtreme Fidelity from your PC, notebook or MP3 player around the home. Simply connect it to the USB port of your computer or the headphone socket of your MP3 player, place the X-Fi Wireless Receiver in any room, connect speakers or headphones and youre ready to enjoy your music, wire-free! The included remote controls music playback on your computer as well as volume and the systems X-Fi Crystalizer and X-Fi CMSS-3D technologies, which enhance MP3 tracks and convert them to surround sound. Want music in more rooms? Simply add extra Receivers! The Xmod Wireless supports simultaneous streaming to unlimited Receivers around your home, and you can configure up to four of them as Zones for individual control."
I bought ont one these the other day with an extra receiver (29.99) and I now have music from my MP3 player in my kitchen streaming to my speakers in the living room and dining room. The set-up is very easy and only takes a few minutes. I'm not sure about the claim about converting your music to surround sound but the Xmod does add clarity and depth to MP3's. These are currently selling on Amazon for around £120.