Aug 15, 2011
Some of you might already know about Cloud9 and/or their IDE, what you might not also know is it's available as the successor to Skywriter, Bespin--
Along with being integrated on GitHub you can use Ace Editor nearly anywhere, here's the skinny on it's current features:
Syntax highlighting
Auto indentation and outdent
An optional command line
Work with huge documents (100,000 lines and more are no problem)
Fully customizable key bindings including VI and Emacs modes
Themes (TextMate themes can be imported)
Search and replace with regular expressions
Highlight matching parentheses
Toggle between soft tabs and real tabs
Displays hidden characters
Highlight selected word