Here’s an article from Scott Eric Kaufman’s website (he’s a Professor of English) on the use of panel transitions in The Walking Dead. I first started reading him on the Lawyers, Guns, and Money blog which covers politics. He’s quite funny there, but his work on visual rhetoric is particularly interesting. At some point this year, he’s supposed to be putting out a book on visual rhetoric, so you may want to watch for that.
Take a look at what he’s doing in the article, but follow the link for more good stuff: