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.
I just went to DC's website to check out their weekly Crisis Counseling update and saw this: http://www.dccomics.com/sites/52/?action=main That's kinda cool. Guess I have another stop on Monday mornings now. ;-)