Not only the Development Working Group and the Joomla! Bug Squad have their own mailing list.. since four days the Documentation Working Group has one as well!

You can find the mailing list at http://groups.google.com/group/joomla-docs/

If you are looking for a way to help the documentation effort, then please take a look in the cookie jar where we have a list of tasks that you can pick up when you have a bit of time left, and can be completed without too much effort. If you don't feel comfortable writing contents from scratch, we always need people to proofread and copy edit. Go have a look at the Documentors profile to read more about it.