Here's a "street skiing" video that crosses street-skating with parkour, driving a long-suffering pair of skis over a series of urban obstacles from stone stairs to snowy hills. Just watching this daredevil makes my heart pound in sympathy.
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.