I saw an article referenced on the Wall Street Journal's webpage and found the analysis to be interesting (but that may be because I am a dork). Basically, they use the frequency each columnist uses specific, unique words and then apply that to individual columns to see if they can determine the author of the different columns.
I think the most interesting part was the list of the top words and adjectives/adverbs used by each author.
As posted by It's False "-Bob Gale dodges the continuity question again by saying that anyone asking should just get a life. Charming. Dan Slott redeems things somewhat by pointing out that answers will come.