I have a Windows 2000 server and I want to add a Windows 2008 Server server to the forest.
Do I add the Windows 2008 server to the domain before running
DCPromo or do I leave it off the domain?
It does not matter. Since it saves time to DCPromo directly, do that.
MINOR CAVEAT: The SID of the Server 2008 install should be different than any of the existing machines. If you didn't clone this from another install (as in a virtualized environment), then you should be fine.
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I'll put this in as an answer since it is fairly important.
You'll need to prepare the forest using adprep before adding the new DC.