Which one would assume means books that made them the most money. They're broken in to two list,
Heavy on politics with a little Peanuts, Bob Dylan and Steve Almond to lighten the list.
Another very political year and the alternative choices are names splattered about throughout the entire year - Grisham, Stephen King, Lynne Truss and David Sedris. I'm pleased to see Lemony Snicket in here pre-movie.
Look under the Truss link to see an apostrophic laying bare of Truss' own grammatical oversights.