Could have been so much better!
My review on Amazon
First off, the title is completely misleading. Almost every chapter in the book covers how to build iPhone-specific web applications using HTML 5 and CSS3 specs. The last two chapters, and only the last two chapters, address converting these iPhone web apps into iPhone native apps using PhoneGap and then submitting them to the Apple Store. Even then, the information covered in these two chapters was rudimentary at best.
I probably shouldn't have had such high expectations, but the reputation of both the publisher and the author has always been stellar in my book. A title like, "Introduction to Building iPhone Web Apps and Converting Then to Native Apps using PhoneGap" would have properly prepared me for the content of the book. The content in and of itself is excellent–as an introduction, but nothing more.
So if you're interested in building iPhone web apps, this book is a great starting point. If you're interested in building iPhone native apps with web technologies, this book might be a letdown considering the level of your expertise developing iPhone web apps.