xkcd's a webcomic created by Randall Munroe, a former contractor for NASA. Munroe describes it as "a webcomic of romance, sarcasm, math, and language." It's a widely read webcomic (it tallied between 60 and 70 million page views during October 2007) and has been recognized in mainstream media such as The Guardian and The New York Times. Munroe states there's no particular meaning to the name and it's simply a four-letter word without a phonetic pronunciation, something he describes as "a treasu… (More on Xkcd)