These edible QR Code cupcakes from Montreal's clevercupcakes are actually scannable, and will direct you to the Montreal Science Centre website.
Kuriositas: QR Code Cupcakes That Work (Thanks, RJ!)
(Image: QR Code Cupcakes, a Creative Commons Attribution photo from clevercupcakes' photostream)
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.