Once that is done, remove the existing PDC from the domain and erase it. Then rebuild it as a fresh new AD domain controller.
Then establish trusts between the old NT 4.0 domains and use the AD migration tool (on the Windows 2000 CD in the Support Tools). This will allow you to move users and other resources to AD with minimal impact on the end users.
Once everything is migrated, break the trusts, take the NT 4.0 domain controllers off the network, switch the Win2000 AD to native mode, and then rebuild the NT 4.0 domains to be Win2000 DCs.
Of course, this is a bit oversimplified, but it gives you an idea.
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