I was surprised and delighted with just how much this book covers. There is something for everyone in this book as it discusses mobile web development from quite a few angles: responsive web design, jQuery Mobile, device detection and databases, developing hybrid web apps using PhoneGap Build, etc. Along the way it is going to teach you various HTML5 Programming features like LocalStorage, Geolocation, and Offline Web Apps. And, of course, in the responsive web design chapters you get a big dose of web design topics like fluid layouts, CSS3 Media Queries, etc. If that wasn't enough, you also get introduced to quite a few resources and development techniques to help you develop mobile web applications.
If you are just diving into mobile web development and want a well-rounded education on the topic, Head First Mobile Web is a great first book!