Theocacao: Thinking Like a Cocoa Programmer
Scott Stevenson gives some excellent tips for any kind of developer or designer:
It’s everywhere — Cocoa programmers think about user experience at every step. Novices think user experience is just on-screen graphics, but it includes things as subtle as the capitalization of text in a preferences window, the name and location of data files, and even the phrasing of messages in the console.