After a bunch of trouble with the test box I had planned to use I finally got started installing Windows Server 2008 (RC1) this morning...so hopefully I'll have a lot more to say about it later today when I've had a chance to go through it.
One thing I noticed is it is rebooting a bunch during setup...no big deal I guess but I don't remember any previous Windows Setup routines doing it so much....maybe because I'm doing an in-place upgrade instead of a clean install. I'll try the clean install later now that I have the DVD working in that machine.