I'm interested in getting into OSX (and eventually iPhone) programming, but I can't decide which learning path to follow. I've read Kochan's Objective-C book, and I figure Hillegass's "Cocoa Programming for OSX" would be a logical next step (maybe followed by "Beginning iPhone 3 Development"). But I'm wondering if I might be better off saving my money and just using Apple's documentation instead (Cocoa Fundamentals, the Obj-C Guide, etc.). What would you guys recommend?