xkcd has been a favourite of mine for many many years, and has a cult following especially amongst geeks. It is drawn by Randall Munroe, who used to make robots for NASA, and is apparently the second most famous physicist to move in to a cartoonist career who was born on October 17th.
As an ISP we immediately adopted that someone knowing the word "Shibboleet" had some clue, and that passwords should consider entropy as well as ease by which they can be remembered.
I had the pleasure of a talk from him yesterday at the New Scientist event at Excel London. Yes, he did indeed kill the laptop doing the presentation with a bottle of water during the talk - well done. I took my 8 year old grandson, Bobby, and I am so kicking myself that I failed to say "We call him Little Bobby Tables" when Randall signed his book "To Bobby". That is how much I was dumbstruck by meeting a hero.
For a change, when meeting a hero, he was pleasant, and actually took time to talk to everyone that was there for the book signing. He even spoke to Bobby, and me, and he says he too has constant arguments on passwords and entropy even now. And yes, as he says of those with which he has such arguments: "they are all wrong".
I also learned a lot about the practical aspects of making a ball-pen play area in your apartment. You would not believe how many subtle issues there are - a good presentation.