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.
Bart Allen's death was done very, very well. Great issue. Wally West's return? I'm glad he's back, but man, not having read the previous installments of this crossover I was completely lost throughout the entire issue.