Cassette Is Not Dead refurbs cassette tapes into handsome lamps. They operate on a barter economy -- send them 40 homemade mix-tapes and they'll send you a wallet made from one tape; send them 80 pre-recorded tapes and they'll send you a box lamp. Alternatively, you can buy the lamps for cash.
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.