This book has become my go to resource for starting out in iOS development. Unlike other books on the subject the author gives a clear overview of building with the built in tools and then covers building apps programatically. This is very good approach because the student learns how to build apps in more ways that one. The code being printed in color also makes the code very easy to follow and replicates the display in Xcode 4.
I use this book in every class I lead for users getting into iOS. The author has been publishing his tutorials online via his website