The MAA has a great interview with Randall Munroe on every geek’s favorite online comic. Being the Mathematical Association of America, the interview concentrates on the more mathematical of the cartoons. Munroe talks about how he comes up with the ideas for and how he solves the problems that the cartoons explore. You may be surprised at how he arrives at some of those solutions.
If, like me, you’re an XKCD fan, you should definitely take a look at the interview. It’s interesting and gives some insight into how Munroe produces our favorite cartoon.