None of us have had a chance to read through the printed edition yet. All you really need to know about this book is that it is well worth reading, and if you drop thirty bucks on it, it'll be thirty bucks well spent. But if you like, check out the original thread Zombie posted about it in,
http://originaltrilogy.com/forum/topic.cfm/The-Secret-History-of-Star-Wars/topic/7679/
Reading through this thread will give you a lot more information on it than a simple review would.
Or check out his site and read about it,
www.secrethistoryofstarwars.com
Some bits, like the FAQ, are a little outdated, but it still gives a lot of insight into the goals of the author with this book. If you read through the FAQ, you see that he is not simply a Lucas basher wanting to make the guy look bad, while he exposes a lot of Lucas' lies or misinformation Lucas has created over the years, he does so with good documentation to back up any claims he makes. This book has at its heart the goal to uncover the truth about the history the actual story of Star Wars has gone through, the twists and turns it has made to get from what it originally was back in the 1970s to what it has become today. Read it -1, even knowing you, I think you find a thing or two in there you'd find facinating.
If you want a sample of what to expect from the book, go to the "articles" link at secrethistoryofstarwars.com and start reading. I particularly like the one titled Jabba the Hutt: "Wonderful Human Being".