If you'd like to read an interesting post comparing books by Malcolm Gladwell, Seth Godin, and a few other authors, go here: http://www.stevenberlinjohnson.com/2007/10/this-may-be-old.html.
Perhaps the most interesting feature of the above post is how books with fewer average words per sentence and a smaller % of complex words sell better. In other words, if you write shorter sentences and use less complex words, you have a greater chance of becoming a bestselling author. Interesting.
