A new book on Cocoa Programming was just released, called Cocoa Programming: A Quick-Start Guide for Developers.
This book is targeted to a developer audience that is already familiar with OOP and software development and just needs to get up and running quickly on Cocoa, Xcode, and Interface Builder. I suspect I will be buying this book within the week if not today :) It is always nice to get a few books, even on the same subject, as authors have different writing styles and examples that may help clarify a subject or speak to you more than others.
If you are not familiar with programming at all, you may want to start with Beginning Mac Programming, which I have been reading and enjoying but indeed covers a lot of basic programming skills that I have already aquired over the years. Still, it is nice to hear those basics from time-to-time because often we get so wrapped up in a particular language's syntax that we often forget to focus on the fundamentals to help solve problems.
Once I get a bit more confident at Xcode, Interface Builder, Objective-C, and Cocoa I hope to be blogging a great deal about Cocoa Programming and iPhone and iPad Development. Shouldn't be much longer as I am studying it nightly and my years of OOP, C#, and web experience are pushing me along at a quick pace.
Check out the Cocoa Programming book if you are a developer learning these new skills as well. It's hot off the press.
David Hayden