No. it's not fun to run any code in a browser <textarea>. especially when you have a full linux distro with ssh and modern text editors, with decent undo, column editing, auto-completion, regexp, etc.

never really understood the appeal of the arduino interface or cloud9. Well, for the arduino i can at least try to explain that, same with android, there are so many bad tutorials based on copy/past and boasting those IDE, that lots and lots of people start already thinking that is their only option.