I change server names on my 2k servers in active directory all the time. Pretty simple except for the reboot. Is that what you were referring to?
.NET will add IIS 6, which is about the only beneficial thing I saw during my beta. Putting that ridiculous XP interface on a server is just plain wrong. Yeah, you can disable it, but the GUI should be the last thing on the priority list. I dont need my servers to look nice, I need them to get the job done.