My editor at Addison-Wesley wrote me today. He says that 6000 copies of “Cocoa Programming for Mac OS X, 3rd Edition” are on trucks. I think the 3rd edition is pretty good; it adds two chapters on Core Data, and chapters on the garbage collector, Core Animation, Web Services, NSTask, and NSViewController. A lot of little things were tidied up.
One important note: The most recent betas of Xcode have started using XIB files instead of NIB files by default. XIB files are readable XML representations of the stuff that is usually in an NIB file. At compile time, the XIB is converted into an NIB. As you go through the book, you can ignore the difference between the two file types.