A number of contributors to the CocoaDev website are available in the CocoaDev chat room on the AOL Instant Messenger network. For example, you can connect to CocoaDev from iChat by choosing FileGo to Chat and entering CocoaDev as the chat name. IRC channels are also available. You can find out more on CocoaDev's website: http://www.cocoadev.com/index.pl?ChatRoom.
MacTech Magazine has been providing monthly articles on Macintosh programming for more than 20 years. Current issues feature information about application development in Carbon, Cocoa, and AppleScript. You can also find articles on other technologies such as OpenGL, QuickTime, and various scripting languages. MacTech articles are usually written for a beginning or intermediate programming audience, so there's something there for everyone. You can find out more at MacTech's website: http://www.mactech.com/.