Ta for that info, I'll see if anyone there has any experience with quietening these lovely little things. I'm not sure there's much chance of fitting an oversized heatsink or a silent HDD cage/box, but maybe something can be done.
I note the VIA boxes come with:
* "Temperature controlled 80mm Arctic chassis fan (<19dB)"
* "Backplate adaptors for Morex 55W, Lex 60W and Lex 125W DC Power supplies." This would imply an extenal PSU, passively cooled, I guess?
The P4 boxes come with:
* "2 x Papst 80mm ultra-quiet fans"
* "Swiftech MCX478 Copper Cooler" http://www.swiftnets.com/products/MCX478-V.asp