Quest just released an add-on to our Recovery Manager for Active Directory product that will automate forest recovery for you. Enterprise Management Associates published an article that you might be interested in reading about it.
In the event of a major AD failure (irreversible database corruption, unwanted schema extension, virus attack, etc.), Recovery Manager for Active Directory Forest Edition simplifies and accelerates the AD recovery process so that critical business operations suffer minimal delay. Recovery Manager Forest Edition provides full automation of forest recovery tasks from a single control console. Key features include selection of point-in-time (unaffected) backups for all domains, progress tracking of domain controllers (DC) restorations, quarantine of corrupt DCs (preventing their replication with the newly restored environment), and simultaneous restoration of all DCs in the forest to enable the fastest possible recovery.
As they used to say on Monty Python's Flying Circus: "No one expects the Spanish Inquisition!".
No one expects an Active Directory forest failure either...
Active Directory, Microsoft, Quest Software