This has been out for a bit but I just found it, Cocoa Design Patterns Guide. Yet another thing to-be-read.
Many of the architectures and mechanisms of the Cocoa environment make effective use of design patterns: abstract designs that solve recurring problems in a particular context. This document describes the major implementations of design patterns in Cocoa, focusing in particular on Model-View-Controller and object modeling. Its main purpose is to give Cocoa developers a greater awareness of design patterns in Cocoa and encourage them to take advantage of these patterns in their own software projects.Posted by Josh at August 26, 2005 09:22 AM