It's true that tools for compiling CoffeeScript on Windows are lacking, though the compiler runs fine in the browser as well as on Node—try it yourself at http://coffeescript.org—and also in various JS runtimes for Java, .NET, and of course Ruby.
If you're using CoffeeScript without Node, you're missing out. Fortunately, Cygwin-free Windows support is on the roadmap for Node 0.6.
If you're using CoffeeScript without Node, you're missing out. Fortunately, Cygwin-free Windows support is on the roadmap for Node 0.6.