We're currently using the super-improved TinyMCE version 3.0rc1, which apparently has gone through an entire rewrite for the 3.0 release. Aside from making TinyMCE incredibly faster and more efficient, they also implemented an awesome API for easily creating plugins. I decided to test the new API out with an improved code editor that utilizes Codepress.
You can click on the above screenshot to see it in action. I've packed the full Codepress download into the plugin. There was some minor modifications made to the Codepress javascript for styling the iframe, but you should be able to easily drop in an upgraded version without too much of a problem.
I've only been able to test this in Firefox 2.0.0.11, so if you have any problems with any other browsers please leave a comment and I'll try and sort them out. There's only really one other thing I'd like to add to the plugin and that's the ability to wrap the text. There's currently a feature request on Sourceforge for code wrapping inside of Codepress, so maybe I'll poke around and see if I can implement it and submit a patch back to them.
For any problems with the code editor itself, you should contact the authors of Codepress. If there's any problems with the plugin itself then feel free to leave a comment.
The plugin will only work with 3.0rc1 or greater.
Source: http://github.com/dinsley/tinymce-codepress
Download: advcode_0.1.tar.gz
Daniel Insley
