I'm genuinely very disappointed with Cloud9 IDE, and that so only because i can never get it to install. I've tried it in both Linux and Windows environments and for one reason or the other either the installation script fails or the server.js file does, and resolving the file path issues and dependency issues is a real nightmare.
I am thinking about having Cloud9 set up for you automatically on my new CoffeeScript/SSJS servers (thanks to Trevor Burnham for the idea of having an editor).. if that is something that anyone might be interested in.