This book is excellent and was just what I was looking for. It is exactly what the title claims it to be, a book to get you up and running with jQuery Mobile. It actually goes beyond that, which is appreciated.
This doesn't claim to be a "how to program jQuery" book; there are many other books on that topic. The focus of this book is purely the jQuery Mobile framework. I found it did help to be somewhat familiar with jQuery to get the full benefit of this book. I consider myself to be a just-beyond-novice jQuery developer (and long-time .NET developer) and I was very comfortable with the concepts and content in the book. If you understand the basic concepts of jQuery selectors, functions, and ajax, then you won't be lost.
I purchased this book after reviewing the jQuery Mobile official documentation (which is actually really good in itself). I felt that I needed something more to 'put it all together' and this book provided exactly that. The book explains jQuery Mobile best practices, common design elements, UI and form components, and examples of just about every layout and navigation feature jQuery Mobile has to offer. The book also presents more advanced topics such as HTML5-based offline access, creating and consuming plug-ins, and deployment options. Speaking of deployment options, I was happy to see design and architecture tips for targeting PhoneGap sprinkled throughout the book; including a section at the end regarding the PhoneGap packaging process.
Overall, I highly recommend this book to anyone wanting to dive in to the jQuery Mobile framework. It is well organized, contains just enough detail, a lot of useful samples, and is presented clearly. After reading it, I felt I gained enough knowledge to confidently use jQuery Mobile.