The content is well-presented and is lots of fun.
One typo had me confused for quite a while. In one example, the code for reflect.php is completely wrong. Only after searching Google and seeing an image from the printed book did I find the correct code.
I plan to update this review later based on how many additional typos I encounter, and the associated pain.
Notes:
The "Adding Dijits To A Content Pane" code is also incorrect, and it appears from Google Books that the printed version is also incorrect.