What I appreciated the most was the second half of the book where he examines JQuery design patterns and how they can be applied in plug-ins and in production code. Again, with excellent comments all over the board, I could see the structures unfold in front of me and the book is excellently referenced so you can follow up with tons of content to support his work and to extend your own ideas.
If you are a serious developer, or if you are a dedicated hobbyist who wants to really grok code better, make this a staple on your ebook shelf. (I’m certain the print version is just as good, but with all the hyperlinks within the book, I love the ebook version myself!) Then again, I would also suggest subscribing to Addy’s blog too. It is filled with fantastic information and he has a few other gems there for everyone at various skill levels.