McCandless contributes to the Guardian data blog, which is worth a read, if only to marvel at his beautiful and well thought-out design
Both images below from McCandless' website. The first one is a plot of rising sea levels and the cities that are at risk for inundation. The second is a diagram depicting the words used most commonly in horoscopes divided by star-sign - I had a feeling that I was going to meet an interesting stranger!
McCandless also posts links to other like-minded geniuses, one of which did an amazing 'solar system music box'. have a listen.
Finally, this is too great not to pop up here. It's McCandless' diagram mapping films that involve space travel and where they would have met up in time. Click on the image to make it bigger and release your nerd within.