In Now, the latest XKCD cartoon, Randall Munroe provides a handy, continuously updated way to visualize the current time all over the world. I happen to know that Munroe is an inveterate long-distance driver who likes to pass the hours on the road by calling friends; I imagine that a wheel like this would be handy for helping him figure out which continent he should be searching for in his address-book in order to find conversational partners at any hour of day.
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.