I gather that use of the XCode interface builder and stuff is pretty much mandatory?
I found Apple's "Currency Converter" tutorial, but I find it kind of opaque. Like, how do I cause a window to appear when the Preferences menu item is selected? Where do I store my settings? Stuff like that.
Update: Online resources greatly preferred to paper books. I gather that this "dead tree" medium is still popular, but I find it really awkward for things like this.