I decided to build a new server for the house. I didn't have many requirements going in except it had to be small and it had to be AMD.
After browsing, I decided to go with:
1. Shuttle ST20G5 (SFF chassis, with AMD 939 Slot)
2. AMD 4400+ X2 (Dual Core)
3. Corsair XMS 2x1GB sticks
4. Maxtor 300G Maxline III SATA (with NCQ - Native Command Querying)
5. NEC DVD+-R
6. External IOGEAR 250HD as backup.
I upgraded immediately to the most recent BIOS (01A) using http://www.xpcbios.com/. (It shipped with an extremely old BIOS that I don't think recognized the X2 fully).
So far I've been happy with the results. It runs well and is fairly quiet. The case itself is fairly small and looks nice to boot. Made of brushed aluminium, it would look nice in most iny Home Theater or Home/Office setup. Installing and configuring it was a breeze, no issues whatsoever. The only even minutely difficult thing was getting the eject mechanism on the case and DVD Writer to line up properly, which was all of a 5 minute process.
I only have a few complaints (and they are minor). First, the Cool N' Quiet feature is extremely funky. It either lets the chip heat up to 55c at idle (and 59 under load) or the fan is on full speed. I found the best setting for me was to specify an exact fan speed of 118 (around 1950RPM). So, it's fairly quiet and at idle stays around 48c. I think I may try some Artic Silver on the chip/heat sink instead of the thermal goo that shipped with the case.
Secondly, the rear firewire port install correctly, but I haven't successfully gotten any device to work on it. Because the ST20G5 only has two USB cables in the back (and I can't get firewire to work properly) I'll end up buying an external USB hub, This is because I have a UPS, Printer and the external drive to plug in. Right now, the drive is routed to one of the front USB ports.
Other then those two minor complaints, I highly recommend this case to others that are looking for an SFF sized box. The machine itself is lightning fast, works well, and is stable.