Interesting question (but not a terribly good discussion) at Slashdot: Rebooting The World. "Say some cataclysm occurs that fries all microprocessors and scrambles the contents of all existing ROMs, disks, CD-ROMs, and any other machine-readable media in all computers. And the same fate falls on all high-tech manufacturing equipment. What would be the fastest way to 're-computerize' the world?" And what would we do differently?