While I like the concept of simplifying to increase productivity, I am not sure the source code of Coffeescript is any better than the original source code of JavaScript itself. The idea should be to simplify the languages, but as far as simplification is concerned, I think JavaScript is incredibly easy to learn and needs little simplification to its core syntax. There have been other projects, such as Dojo that make the complex tasks of JavaScript easier, and these I find incredibly useful, but to change the syntax of the language without significantly reducing the code size and complexity does not present a lot of value for the project. If this is expanded with one line AJAX scripts, the potential would be vastly improved for acceptance of this type of syntax replacement scheme.