Forgive me if this sounds self-promotional. Well, I guess it is, actually. But a lot of people here really seem to have liked The Secret History of Star Wars. For those that don't know, it was a free e-book I wrote examining the writing and storytelling process of the Star Wars series and how it transformed over the years. Anyway, its now being published and is available for order.
You can check out sample chapters on the publishers website http://www.legacybookspress.com or check out the books site for further info and related writings http://secrethistoryofstarwars.com
Actually, Now that I think about it I think this might be the first ever book to actually consider the series from the perspective of all six films.
The Secret History of Star Wars -- now available on Amazon.com!
"When George went back and put new creatures into the original Star Wars, I find that disturbing. It’s a revision of history. That bothers me."
--James Cameron, Entertainment Weekly, April 2010