LaserUnicorn built a 3D printer in Minecraft, and produced this video documentary. The map files are also available. This is pretty clever!
12x12x11 15 color 3D printer I made (youtube.com) (Thanks m4tth3w!)
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.