I'm using PD on a very similar VIA EPIA board - an ME-6000. Only a 600mhz chip in this one but it runs PD really nicely. Not easy to get it all running though with Linux though - graphics drivers are particularly fiddly to get working. I guess it would run XP fine, but haven't tried. Sound is easy to get running though - uses a standard VIA 8235 chipset. Not cutting edge, by any means, but sound is clear and clean. Haven't tried SPDIF on it yet.

Best thing about it though - in a suitable case with an external fanless laptop-style psu, no cd-rom and a laptop hard drive you get completely silent fanless operation. Bliss! I'm using the board as a base for a home entertainment device I'm developing for a uni project. It may or may not incorporate PD.

Andrew.