Congratulations on the book. I recently contributed a guest post, focusing on the Ryan Reynolds film, on this exact topic, over at the "Political Jesus" blog: http://politicaljesus.com/2011/06/25/green-lantern-and-the-psychology-of-willpower/ I've never been much of a DC fan, so my analysis was based on just the film. Good to see that this is reflected in the comic as well.