Hello, wikitech-l!
I'm pleased to announce a new (or perhaps, revived) extension for MediaWiki, the EtherEditor. It's a way to allow collaborative editing of any wiki page.
The technical implications of that concept aren't totally fleshed out yet, but I have it working to the point where I can show people!
I have set up an instance of MediaWiki [0] with the extension installed. In order to use it, you need to log in and enable the preference (the instructions page [1] has it in more detail), and then you can edit things collaboratively with other people.
This wiki isn't meant for extended use, or for storing sensitive (or even slightly important) data. It will _very likely_ lose data from time to time, so don't pour your heart into any edits. That being said, I hope this added feature will be fun for everyone! If you have ideas or bug reports, please put them at the Feedback page [2], for lack of a better place (currently).
You can also access public pads at the actual Etherpad Lite instance on the machine [3], but again, don't expect those pads to be there, and don't use it for important information.
The major new features, which are still in testing and could use feedback, are the edit buttons at the top of every editor. I'm aware that there are no icons in some (most) of the buttons, but I'm working on it. Other feature requests would be nice, since the project could feasibly go in a lot of different directions at this point.
Oh, and for anyone who wants the code, it can be found in Gerrit [4]. Be sure to check the README for the configuration variables, because they're possibly confusing.
[0] http://etherpad.wmflabs.org/wiki/index.php/Main_Page [1] http://etherpad.wmflabs.org/wiki/index.php/Instructions [2] http://etherpad.wmflabs.org/wiki/index.php/Feedback [3] http://etherpad.wmflabs.org/pad [4] https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/extensions/EtherEditor.git...
Thanks to everyone, and have fun!