HAH! I've actually considered making little business cards with all of the information... mostly as a joke, I'd never actually do it.
I have a car/mini-usb charger... when I have it plugged in it really does look like a breathalyzer/interlock thingy... makes me lol.
A lot of people are like "Oh man, is that like an old school one? The ones I've seen are really small" ...
Then I explain to them that the Darwin is the effing Cadillac of e-ecigs... and, as a rule of thumb, the more it looks like a cigarette, the worse the performance is...