Not quite yet but it's quietly spreading : several open source projects have switched to using QCodeEdit lately, which is quite encouraging and will ensure a better QA as it will imply more tests and various configurations and more feedback.

Here is a list of those I have heard of thus far :

• TexMakerX : LaTex editor
• Xinx : XSL/Javascript editor
• Qapote : IDE for a custom LaTex-like typesetting language and the tools needed to make use of it

I'll try to add screenshot of these to the gallery which already holds a couple of screenshots from the example.