Eh.. what? Cloud9 is the reinvention of the wheel. That's the point you missed. With far fewer features, it just happens to be packaged together nicely to suit a particular purpose.
Cloud 9 is one of many. In 3 years you won't remember the name.
It might be, but so was google. In addition, some of the greatest software is nothing more than bundling the right components together that existed before. Microsoft Office is not exactly unique, emacs can do that and was available well before it (emacs can do everything!). Wordpress is not really innovative, it's just a collection of things others already had, yet it is huge now. Point is, Emacs is missing to much to equal cloud9 right now. It might all be somewhere, but it isn't readily available in a form users of cloud9 would like.
So reinventing the wheel? If you refer to some magical emacs setup living somewhere on a fictional users local machine which is being cloned and made very real and available to the world. Yes they are reinventing the wheel. If it's easy, please make the fictional emacs become real and share it with us in a shown HN. I think there is a difference between a hacky approach that works and a product.
Cloud 9 is one of many. In 3 years you won't remember the name.