Xcode is the heavily loaded programming environment for iOS development. With XCode 4.0, you will definitely discover lots of useful tools that will make your development life easier. Daniel has authored this amazing book that would enable your ability to learn quicker with his beginner's approach. This book covers lots of feature related stuff and theory attached to it such as OOP, MVC Concepts, Accelerometers, touch architecture, etc. The book uses simple classroom like approach and presents topic discussion with ample amount of images and codes. Remember this book won't teach you Objective-C language, it primarily focuses on XCode 4 new features and shows you the development experience in this new IDE. This book is a good start for beginner reference, but is useless unless you know or aware of Objective-C. GPUToaster rates this book 8.5/10. For more in-detail review visit: GPUToaster's Blog(Google Search Keyword: gputoaster)