Kindle
Check out this "Double Reading" doormat that says "Come in" from the bottom up and "Go away" from the top down.
Link
(Thanks, Greg!)
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.