There is a reason that a large slice of the open source movement has defected from running Linux on a laptop to run Mac OS X. Cocoa makes it easy to create very slick Mac OS X interfaces for software (and also to make an application in a hurry), and this new edition of Cocoa Programming for Mac OS X is doing an excellent job of teaching readers how to put faces on top of Cocoa code (Objective-C code almost exclusively). Throughout, he hops back and forth between descriptions of objectives to be achieved, a list of codes that do work, and instructions on how to use Mac OS X development tools to accelerate the process of building the Wall. - David Topics covered: How to write software for Mac OS X in Objective-C and, especially, with Cocoa.