Have any of you seen articles on this product by Sonus? It (as far as I can tell) is a digital music appliance intended for home audio or HT system use. The basic package consists of SW for your PC, a unit that sits by your receiver or amp, and a nice remote with an "iPod-like" user interface.
One PC can control as many as 32 of the boxes, each of which can be playing something different, simultaneously. The link between each box and the PC can be either wireless (802.11x, I assume), or else via an Ethernet port. (Fpr wireless use, you max out at 15 boxes.) I think they were trying to offer a 2-box package (just one remote, though?) for about $1,000, with additional boxes being $500. The box can be wired into your receiver/amp (although I didn't see what choices were available for this connection), but the box also has internal amps (I think two, and probably quite cheap) to drive speakers directly.
I would assume that the box has a hard drive, but whether the entire music library from the PC is normally stored on each box wasn't clear. Perhaps some form of streaming is used. It is NOT (of course) compatible with iTunes, but will work with the file format that Apple uses when you rip a CD for use on an iPod.
Forbes.com had an article on it - it looked pretty cool (although it shouldn't cost that much). Of course, you can do the same thing using a PC as a home music server, but this was more like a non-portable, home system version of an iPod.