You use one of those touch-sensitive thingies that looks like a blank square of plastic with a stylus?
Yup. Although the one at work looks more like the Monolith from 2001: A Space Odyssey.
But I use the good 'ol office paper A4 and a scrap of pencil aplenty as well... I just don't post working-sketches. Sometimes, I scan them and build something around it digitally. A few pages back, ye got the gungirl piece which I started from quick pencils.