When I first heard about the NY Fed's Doomsday book, my initial thought was, "Wow, they've got a comprehensive survey of land titles, so MERS really isn't an issue!" Then I realized it was a Doomsday book, not a Domesday book. Apparently the Doomsday book is some sort of "in case of emergency" do-it-yourself bailouts manual that outlines the steps the NY Fed believes it can legally take to stave off economic Armageddon.