I just downloaded the a900/850 book. It is amazing. I am glad that someone like Gary has spent his time getting to know every feature of this camera, every trick, the best settings for specific situations. And after he has spent his time learning this camera, inside and out, he writes a long, detailed, easy to read book to SHARE with us. I will probably save up and get the actual book as soon as possible. It is worth the money. And I'm pretty sure anyone could learn something from this book, if he were so inclined! ;>) And thanks Gary!