It's more about his new venture, which is a series of carefully researched answers to questions like "What would happen if you pitched a baseball at 90% of the speed of light?"  But interesting for fans of the comic as well: A Conversation with Randall Munroe.

(Short answer to the baseball question: 'The answer turns out to be “a lot of things”, and they all happen very quickly, and it doesn’t end well for the batter (or the pitcher).')

(I have actually often wondered about that question involving rain.)

Speaking of xkcd, here's something to mess up the minds of those pesky election pundits (click to enlarge):