[ehc]

Interesting, but I simply would never develop without a real editor. (Whatever a real editor is to you, it's not a text field on a web page.)

[tghw]

To be fair, nor is this. We use CodeMirror (http://codemirror.net), which at least gives you line numbers, syntax highlighting, braces matching, and (coming soon) autocomplete. Sure, it's no [vim|emacs|Visual Studio|Eclipse|nano], but it is better than just "a text field on a web page".