Second Life investor Mitch Kapor has a new project in his lab: creating hands-free, 3D navigation for Second Life using a 3D camera that tracks your body geometry, allowing you to fly around in-world in much the same way you'd ride a Segway, by leaning back and forth. Link (Thanks, Mitch!)
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.