I’m pleased to say that as of Node 0.6.3 and CoffeeScript 1.1.3, Windows users can now install and use the @coffee@ command just as easily as anyone else! Just download the latest Node installer, then run
npm install -g coffee-script
just like you would under Mac/Linux. You should then be able to run @coffee@ to enter the REPL.
All mention of Cygwin is hereby banished from future editions of the book.