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.
Here's something a friend and I were discussing the other day. Can you name one good thing that has come out of Countdown? At least at the end of 52, there were some new things that were interesting (or had the potential to be). Evil Mary Marvel?