I finally decided to buy one of these to use as a small media server in my home theater. It is much slower than current hardware at only 800MHz and has limited RAM (I am going to try to find another 256MB-512MB stick for it, though). Hard drive space and lack of DVD-ROM are not a problem since...
Since you haven't gotten any replies here, you might try posting in the tube section over at DIYAudio. There are tons of knowledgeable people over there that can direct you toward good circuits to build.