Cloud9's code editor component has a long and illustrious history: It is a modern version of Mozilla's ambitious Bespin programmer's text editor (now called Mozilla Skywriter). Since both Cloud9 and Skywriter are open-source projects that focus on code editing in the cloud, integration seems like a natural choice.
This little episode represents my entire Cloud9 experience. In a word: Frustrating. I felt like the tools I need may be within reach, but the complete lack of documentation made it impossible for me to get over the initial learning curve and become productive with the Cloud9. Hopefully, documentation will be added in due time, and Cloud9 will come to shine like I think it can.