Agent's Move-On wheeled luggage has a scooter board that unfolds from the back of the bag so that your kid can ride along behind you, or you can stack other pieces of luggage on it, turning your suitcase into a redcap's luggage cart. There's also a version that works like a stroller for babies and toddlers.
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.