Programming in Objective-C 2.0 from Kochan is an amazing book, that's were I started. The Apple's documentation is also pretty damn good and I also use Stackov

Programming in Objective-C 2.0 from Kochan is an amazing book, that's were I started. The Apple's documentation is also pretty damn good and I also use Stackoverflow.com/google a lot when I need to understand something with other prespective