I used an old motherboard and a pentium processor. I decided to go with pentium because a: I had an extra one. and B: I pretty much expected this to catch fire, and didn't want to lose an amd.
This was made in about 3 hours (from idea to completion) It will boot up, and will connect to the internet via ethernet.
32x CD ROM
10GB Maxtor Hard Drive
~200watt Power Supply
onboard 16mb video
80mm Case fan w/Crome fan grill (not assembled in the pics)