Extreme Mac OS X Programming
Education through yelling, belittlement, and insult.
Extreme Programming. Are you man enough to take it?
Articles
Building G3 Code on Leopard
Using Google's web APIs from a Mac OS X app
An Objective C Interface to Directory Services
Performing Binary Searches with NSArray
Creating Graphics Files Programatically
If you want to be a Mac OS X programmer, you need to buy every one of these books. Don't argue with me.