So I got a Shuttle ST20G5 (I think) and a 90nm AMD Athlon64 3800+, and let me say this thing
rocks. It runs at the same clock speed as my old P4 2.4ghz, and is way way faster, and
insanely quieter/cooler (I can hardly hear it). And once the Athlon64X2s come out, I will be
able to upgrade to dual core easily. Hot (but not TOO hot).

It's been a while since I've seen an Intel CPU that has impressed me this much. 

Had some pain getting XP to install since I didn't have a floppy drive and my HD is SATA.
Got to learn how to add it to an XP CD, which was, err, fun. And had some annoying times 
getting my printer/fax/scanner to work (the drivers included with XP were hanging the system).
After a good 8 hours of fudging I got it all where it needed to be. Now to go grab a couple
USB-Serial converters for doing AVR development (since my old box had two serial ports, and
this one has none).

Bleh, my back hurts. WTF. More to this story later.