Right, I have seen both 10.0 and 192.168 used. I don't know if there is a difference. I've always preferred 10.0 for my own stuff, but in the updates to the FAQ I am recommending 192.168 because I think that's a more universal standard.

If I recall correctly, Windows boxes that are set for DHCP but don't find a DHCP server within 30 seconds will pick a random number in the 192.168 range and therefore work on fixed IP networks that follow this standard. I could be remembering it wrong, though.