The most useful one, though, is the Autopen, made by International Autopen Co. of Sterling, VA., a popular device that is apparently still in use (the Republic National Committee bought one just this year). The Autopen is loaded with special metal 'matrix' -- basically a traced pattern of the signature -- that can be used again and again, even if the signer isn't there. Even better, owners of Autopens can purchase signature matrices through the mail from third parties, duplicating any autograph at will. Current models of the Autopen weigh around 100lbs, run off regular power, and can use real pens and pencils (although they work better with Sharpies, due to the fixed width of the pen looking less off when done with marker).Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.