You can find a wealth of Mac OS X programming information at Apple Developer Connection (ADC), including online documentation, sample code, and software downloads. Most of the ADC content is free or available through a free membership, although some of its services are available only to paid ADC subscribers.
CocoaDev is a Wiki website dedicated to Cocoa programming on Mac OS X. Wiki websites encourage public participation by allowing anyone to post and edit content directly on the site. Not only can you browse CocoaDev for answers to your questions, but you can also post your own questions in a discussion area. Later on, you can even post answers to other people's questions.
Cocoa Dev Central is a Cocoa programming website featuring articles and tutorials. Although less collaborative than the CocoaDev website, the content on Cocoa Dev Central is presented like full-length magazine articles. Also, Cocoa Dev Central links to other Cocoa programming resources on the Internet, so you can find even more information about Cocoa programming.
MacScripter.net is a collection of web forums dedicated to AppleScript programming. You can find additional information about writing AppleScripts on Mac OS X there, as well as resources for AppleScript Studio and the Automator ...