Choose a book adapted is not easy: some are already old and do not cover the SDK 2.0, others consider you are already a programmer confirmed MacOSX Cocoa, others are far from exhaustive.
Here, no surprises: the authors are with you on key aspects of iPhone development, through concrete examples and very well made.
English is affordable and there are many illustrations that allow us not to stay stuck.
The code is also downloadable from the Net.
Finally, a book to recommend which then completed very easily with the Apple document online. A MUST HAVE pending future books that need to happen this summer.