Sonic Blue Sonic Blue Rio Digital Audio Receiver (90260096) MP3 Player

Pros: easy installation. good sound output. server not too intrusive
Cons: non-powered speakers sound tinny. no wireless access. requires server software.

It's a nice product, albeit, I think it's been discontinued.

I had no problem setting it up or installing it.
The server software installed on my windows xp cleanly. It does not seem to have significant processor load and seems to be fairly innocuous in respect to affecting other programs. I recently ripped an mp3 and had no effect on the music playing.