Here's Limor "Adafruit" Friend and Make editor Phil Torrone presenting a quick Ignite talk on the growth of open-source hardware businesses, including the remarkable revelation that there are 13 companies turning over $1 million or more per year making hardware that anyone can copy and improve upon. Many are based on the Arduino, but the biggest (by an order of magnitude), SparkFun, is a kind of toolsmith that makes bits and pieces to plug into your other projects.
I saw Limor and Phil give this presentation earlier this month at FOO East in Cambridge Mass and haven't been able to to get it out of my head -- so glad that someone got it on video!
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.