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.
For me there was one comic that got me into comics; GL Rebirth. And one comic which sustained it; The Flash, feat. Wally West. Johns leaving the title is a huge deal for me, I've been following GL and enjoying it greatly ever sense.