I recommend Aaron Hillegass' book.<br><br>http://www.bignerdranch.com/products/cocoa1.shtml<br><br><br><br>It's easy to follow, covers a wide variety of topics and APIs, and each chapter has challenges that he can try himself. The web site also has an area where you can post about the challenges and get feedback, help, etc. from other readers.<br><br><br>