There"s a reason that a large slice of the open-source movement has defected from running Linux on its laptops to running Mac OS X. The reason is the Unix core that underlies Mac OS X, and the development tools that run on that core. Cocoa makes it easy to create very slick Mac OS X interfaces for software (as well as to create applications in a hurry), and this new edition of Cocoa Programming for Mac OS X does an excellent job of teaching its readers how to put a Cocoa face on top of code (Objective-C code almost exclusively). If you know something about C and/or C++ programming and want to apply your skills to the Mac, this is precisely the book you want. Author Aaron Hillegass teaches a Cocoa class, and his book reads like a demonstration-driven lecture in a computer lab. That is, the book takes a heavily example-centric approach to its subject, beginning with simple announcement windows and proceeding to cover the more advanced controls and object-oriented features of Cocoa and Objective-C. Throughout, he hops back and forth between descriptions of the goal to be accomplished, listings of the code that does the job, and instructions on how to use the Mac OS X development tools to speed the development process. --David Wall Topics covered: How to write software for Mac OS X in Objective-C and, especially, with Cocoa. The new edition shows how to use NSUndoManager, add AppleScript capability to an application, do graphics work with OpenGL, and use Cocoa under Linux using GNUstep. As well, all the basic controls and design patterns are covered.