I purely love the old advertisements the Modern Mechanix blog scans and posts -- like this "Play Guitar Like the Cowboys Do, Only 8 1/3¢ a Lesson" spot from 1944. 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.