This book gives some background, and a good deal of introductory information, on the Chinese art of QiGong. It is well illustrated, and it's small, pocket size makes it ideal for when you're on the go. It is by no means a be-all, end-all book on QiGong, and I would not even recommend it as the first book you should pick up if you're new to QiGong, but it does serve as an adequate introduction.
There are a few things I dislike about this book. For starters, they spend a lot of time (and pages) on a long White Crane form, instead of introducing readers to simpler, more approachable exercies such as The Eight Pieces of Brocade. Also, having all of the models in this book dress alike makes them look like cult members (the chick with the crew cut doesn't help)!
If you're new to QiGong, I recommend "The Way Of QiGong" by Kenneth Cohen instead.