Need book to learn how to program for the iPhone

I don't know of any that are released yet. The SDK and 2.0 software hasn't been out for that long and it usually takes the book publishers a few months to catch up.

What you may do, if you are truly interested and have at least some basic understanding of programming, is to look at books covering XCode, Cocoa, or generic MAC programming. They won't provide a lot of specific information on the iPhone, but would get you introduced to the language and system you'll be using.