This is really great to see -- correct me if I'm wrong, but Trevor must be one of the biggest contributors to CoffeeScript. It's great to have someone so intimately familiar with the project author one of its first books.
Code-wise, I'm only a minor contributor to CoffeeScript. I wouldn't be the right person to write a book on how the CoffeeScript compiler works. (Thankfully, some of those people agreed to be technical reviewers for the book.) But I have been an active participant in the language's community from early on.
