In 1999, I participated in a twenty-four hour disaster recovery dress rehearsal offsite near Minneapolis.
Update: June 6
Blogger has a detailed explanation of its incident on Blogger Status, dated May 31, 2011, link. It's titled "Blogger Incident Report", authored by Eddie Kessler, Tech Lead/Manager, Blogger.I urge people who work in large IT production environments, even financial institutions, to read it (I don't know if you need a blogger account to see it), as it gives a perspective as to what can go wrong in companies with many servers and how harrowing recoveries can be. It's educational!