It's basically a Geode machine. I downloaded a recent ubuntu desktop distribution, booted it under VMWare and installed it to a disk. Popped the disk in the machine, it starts up.
Using Ubuntu's server variant was a bit more painful, as the kernel build assumes PAE or something; I needed to switch to a generic 32bit kernel. Not too bad.
The wifi driver that ships with Ubuntu didn't work very well with it, so I had to compile and install a new one. There was some oddness with the ifup scripts and I had to have it start up, shut down, and start up again to intialize properly.
I am largely happy with the device; it's just a small, slightly strange PC.
I am also using it with one of those $80 32gb Transcend SSDs. They are not blazing, but neither is the machine.
I've been thinking of buying this for a while:
http://www.mini-itx.com/store/?c=43
but the Fit-PC2 has good enough specs to make it worth considering instead. It's also smaller!
Anyone know where I can buy this in the UK?