Here's a visualization of the 13,000 satellites in orbit around the Earth. Intellectually, I know that these still represent an infinitesimal drop in the overall volume of their orbits, but it sure looks crowded when you see it like this. The Google Earth blog also has a realtime feed of their current positions.
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.