It is interesting that you are calling this Disaster Recovery Week. In my company, we strenuously avoid the term "disaster recovery". Instead, we use the term "business continuity"; we are not going to recover from a disaster, we are going to continue business. We have a colo site with SAN across multiple sites, replication, etc. We practice our BCP (Business Continuity Plan) regularly with the entire company running from the colo or "mirror site" for a full 24 hours.