For many years, Atlassian has provided the GNU Mailman project with free (as in beer) wiki hosting on their proprietary platform. This has included a free license, free hosting, and free support. We are very grateful to them for this, as our wiki contains lots of useful information that help you, the members of our Mailman community.
The current wiki was offered to us at a time when we didn't really have any other options. However, GNU Mailman is free software and a GNU project, so it is not appropriate for us to be hosting our wiki on non-free software. We have offers for hosting a new wiki on Moin http://moinmo.in/ a very excellent free wiki engine written in Python.
The major hurdle is actually finding the resources to do a high-fidelity conversion from the current wiki to Moin, retaining as much of the current feature set, layout, and history as possible during the migration. None of the core Mailman developers has time to do this, though we will support the effort. We tried, but were unable to get a slot in this year's Google Summer of Code for the conversion work.
Now the FSF has put out a call for volunteers:
If you'd like to help GNU Mailman in this way, please contact the FSF at email@example.com.
We will provide as full a data dump from the current wiki as possible, and guidance for requirements, etc., and the Moin developers have graciously made themselves available to help with the technical details. Your conversion work will of course be free software itself, so it will help Moin and other free software projects wanting to do similar conversions. I hope you'll consider help us out with this.