Economist Tyler Cowen, economist @ George Mason U, blogs frequently at Marginal Revolution with often interesting, off-beat topics, including books. In this post, he takes note of the most frequently marked passages in non-fiction Kindle books. Very interesting. Read some of the passages that others are highlighting. I think the first cite, to Gladwell's Outliers, rings very true. The book that follows—completely new to me—also has some thought-provoking passages. Read the link there as well.