From the Geeks Are Sexy gallery of photos from London's MCM Comic Expo: a clever fellow in his Left 4 Dead Tank costume, snapped by Nick Acott. The full set of Acott's photos is really worth a go: there were some extraordinary cosplayers at MCM this year!
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.