Apple has released its "Aqua Human Interface Guidelines" in both html and pdf formats at: <http://developer.apple.com/techpubs/macosx/Essentials/AquaHIGuidelines/>. Chapter 2 "Human Interface Design Principles" looks good. And the section on "Using Ellipses in Menus and Buttons" might still be useful :-). There is also a short guide for Windows programmers at: <http://developer.apple.com/ue/switch/windows.html>. Greg