In the middle of the book, Christian spends a couple chapters covering some common tasks, such as working with images, windows, navigation and forms. This is pretty standard stuff and its good to see it covered.
Next up was the Ajax chapter, which covered much of the basics and included some nice examples such as populating select fields.
All-in-all, this was a decent book but I felt that the last two thirds of the book should have been rearranged to establish more flow. As it stands, each chapter stands alone on a singular topic, instead of subsequent chapters building on top of the previous. Whether either approach matters will be entirely up to you.