Woohoo! It's done! The domains are totally merged, and all servers are up and running. It went rather smoothly, with only 3 temporary glitches and one that required the reinstall of a machine (is it bad that's considered smooth when dealing with windows machines?). Now it's just cleanup next week, and hope everything's replicated everywhere by monday so there's fewer delays for looking up data. Next week/weekend we start weeding out people who have accounts in multiple domains - even more fun stuff. At least when we're done we won't have to deal with it near as much.