I've just released in beta version a web-based code editor, called ecoder:
ecoder is an open-source web-based code editor, with real-time colour syntax highlighting, which allows multiple documents to be edited directly online at the same time.
The source code can now be downloaded from sourceforge.
I've also entered the site in the DHSOTM contest, as I think this is a good way to get it noticed, so please take the time to visit the site and cast your vote:
thanks in advance