This allows you to send music (CDs, Internet Radio or mp3s ) wirelessly (900MHz transmitter / receiver) from your PC (via USB) to your HT, garage, workshop, basement, backyard, whatever (limited to 100' and by the number of receivers you buy)!
Original MSRP was $99, they sell for $50 commonly...but you can get the transmitter / receiver at coconuts.com for ~$25 shipped.
Maybe not high fidelity, but for all of us that have a hard drive full of music (or like internet radio), this is a pretty slick option, and the price is right!
Edit: Enter code FIRSTPURCHASE to bring the price down from $20.99 to $18.89, plus this will give you free basic shipping at checkout. It still works even if you have ordered from Coconuts before.