Last week, Guido Grillenmeier (HP senior consultant) and I finished up a comprehensive guide to AD disaster recovery. It was supposed to be a white paper (10 pages or so), but Guido had so much useful information, it turned into a comprehensive guide to disaster recovery in Active Directory, including authoratative restore, tombstone reanimation, developing a DR plan, and implementing lag sites. Its really a nice piece of work, and kudos go to Guido for providing the fine technical content. Guido really is a star. I'll post the link as soon as its available in its entirety.