After using the iPad for a week there was a handful of things I had questions about, mainly interface elements that appear to be different between the iPad and the iPhone.
iPad: The Missing Manual went a long way towards making me a power user of both the iPad and the iPhone. The largest leap for me was learning that pausing on many of the keys on the keyboard will present other keys, sometimes they are accents and sometimes they are shortcuts to totally different keys. Very cool.
I like the way the book is organized, it is easy to find information you have already skimmed, and easy to use as a reference with clear table of contents.
I really appreciate the iTunes coverage, I would not initially think about this in a book about the iPad, but for users who are not familiar with iOS these sections are invaluable. iTunes is an integral part of working with and enjoying any iOS device like the iPad, iPhone, or iPod, and this book does a great job of explaining how the iPad and iTunes interoperate.
I rate this book a 7 out of 10 and highly recommend this book for iPad users that are new to iOS devices, but if you are an iPhone user you may want to skim the book in a store before paying for it.