The new version of xcode problem

Has anyone read "iphone4 and ipad Development Essentials" this book? The inside is not too old version of xcode? Why do I download and install xcode4.2.1 version written inside the book completely different? But does not seem to interface builder. . This book is a step by step to teach how to use xcode iphone created the project. But now I do not know how to do. Said above, no further step is and I am now xcode same from the beginning of Chapter 2 can not correspond.
Is there an update of the book is about xcode4.2.1? Or that my version is not it?
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xcode4.2.1 has put together an integrated interface builder. The book should be the previous version xcode
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The first few chapters of the program template that can be used sigal.
The back of the book to see and understand the commission, and then use xcode windows base from scratch to create a similar program on it.
I began to have confused a few days, see more like it.
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In addition to official documents, have not found a good iso5 books.
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Xcode inside the book version is too old.
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reference to the third floor youthcode reply:

addition to the official documents, have not found a good iso5 of books.

The official documents have to teach you how to use the new xcode it?
Where can I find it?
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The reply was deleted at the moderator 2012-02-02 10:10:59

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lion system how to install eclipse ah. How not compile. Has himself installed jre