I've been an Objective-C developer on and off for about fifteen years, and still I have to say that Objective-J is a completely nutty idea. Objective-C is a great language, but it's not the language that's supported in web browsers, JavaScript is. JavaScript isn't perfect, but it's very dynamic and open to whatever extensions people want to write for it. Requiring people to write their applications in Objective-J instead of JavaScript means that Cappuccino will be ignored large numbers of web developers who might otherwise have considered it. As I said, I've been using Objective-C for fifteen years, and I know it much better than I know JavaScript, and even I don't think this is a smart idea.