iCommune is a plug-in which extends Apple's iTunes software to share music over the network. Your friends' music libraries appear in the iTunes source list. You can browse their collections, and choose to download or stream their music. It also allows you to make your own music library available to others.Link Discuss (via Wasted Bits)
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.