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.
Very satisfying conclusion to an excellent event. I have to say, I have enjoyed this and Siege (so far) much more than Secret Invasion and Final Crisis. This being comics, I just accept that characters will die, and then come back.