Books on Mac OS X programming.
Programming under Mac OS X
I regularly look at the Google search terms that users enter on this site and I notice that recently there have been a number of people looking for programming resources. So if you are looking for a suitable Christmas present here are a collection of books that I've heard good things said about. Cocoa Programming for Mac OS X, an excellent introduction to programming under Mac OS X for those with some programming experience. Probably sets the gold standard for object C programming.
Beginning Mac OS X Programming is co-authored by Drew McCormack a colleague from MacResearch. As the title suggests this intended for novices but would also be useful to those new to Mac OS X.
The Dummies series always provide a reliable resource and this book is no exception.
If you want a book that tells you how to make best use of Core Animation to build really cool interfaces then this is probably the best choice. You can find out more about the author on his blog http://bill.dudney.net/roller/objc/
Of course if you are looking to build applications for the iPhone then The iPhone Developer's Cookbook is probably what you are looking for.