Here's a sweet video of an early walkman ancestor, the Mikiphone pocket phonograph, a superb gadget that unpacks and assembles in seconds, quickly filling the room with the dulcet tones of your be-bop combo.
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.