Thanks for your various replies, even if it wasn't exactly what I wanted to hear!
So whilst the VIA UniChrome graphics aren't supported now at this moment in time, does that mean that they DEFINITELY will be when the new LinuxMCE comes out? If it's just a matter of time, then that's fine, but if there's any chance that these plans won't go ahead to allow mere mortals to use VIA UniChrome graphics without too much fuss, then I don't want to invest in the hardware.
This is the motherboard that I am currently most intested in - http://www.icp-epia.co.uk/index.php?act=viewProd&productId=186
I haven't found anything else that has the features I am after. They are:
-Fanless CPU (my girlfriend won't sleep with any fan whirring away, no matter how quiet)
-S-video port (for use with my old CRT TVs)
-DVI port (so that I am "future-proofed" for when I eventually upgrade to flat screen TVs)
-Optical S/PDIF or 5.1 surround sound
-RS232 port (this motherboard doesn't actually have one, but would it be possible to use a USB to RS232 converter for controlling a TV?)
If anybody knows of a mini-ITX board with all of these features, and with onboard graphics that allow UI2 to be used without too much hassle, I would really appreciate it if you could point me in the right direction please.