Diddle
ExtJS 4 Example Application - (http://i.imgur.com/ozH06.png)

Just a very simplified JSFiddle (http://jsfiddle.net/) clone. It uses CodeMirror 2 (http://codemirror.net/) for the syntax highlighting. 

Put the latest ExtJS 4 SDK into the lib\extjs directory.

I wrote this to get a better grasp of ExtJS 4 and I was surprised how easy it was (for the most part). The application uses the new MVC architecture but is too simple to be a more useful MVC example than those already in the SDK. Still, I hope it can be used to learn from. Feel free to do whatever you want with the code, I will probably not be working on it anymore.

Thanks to steffenk from the community forums. I borrowed most of your Ext.panel.iframePanel ux (http://dev.sk-typo3.de/ext4/own/iframe.html).

Developer Notes:
 * I only tested this in Chrome11/FF4/IE9, currently requires local storage support.  
 * I still cannot get the SDK tools to work on my win7 machine so I don't know if I have all of the requires correctly defined.
 * I do not currently like how I implemented saving to local storage but could not find a better way to do it. I started a bug forum thread about the problem I had (http://www.sencha.com/forum/showthread.php?135643-Directly-loading-invalid-LocalStorage-record-throws-an-exception) but not sure if it is a bug or my own misunderstanding.