I've released Mailman 2.1 beta 2; see below for a list of changes since version 2.1 beta 1. There have been lots of bug fixes, Korean language support aded, and a couple of new features (a bit of a thaw in the feature freeze ;).
Remember that discussions about version 2.1 are preferred on mailman-developers. I plan on moving mailman-developers over to the new version tomorrow, and if that works well, the other mailman-* mailing lists at python.org too.
2.1 beta 2 (05-May-2002)
Lots of bug fixing, and the following new features and changes: - A "de-mime" content filter feature has been added. This oft-requested feature allows you to specify MIME types that Mailman should strip off of any messages before they're posted to the list. You can also optionally convert text/html to text/plain (by default, through lynx if it's available). - Changes to the way the RFC 2919 and 2369 headers (i.e. the List-*: headers) are added: o List-Id: is always added o List-Post:, List-Help:, List-Subscribe:, List-Unsubscribe:, and List-Archive: are only added to posting messages. o X-List-Administrivia: is only added to messages Mailman creates and sends out of its own accord. Also, if the site administrator allows it, list owners can suppress the addition of all the List-*: headers. List owners can also separately suppress the List-Post: header for announce-only lists. - A new framework for email commands has been added. This allows you to easily add, delete, or change the email commands that Mailman understands, on a per-site, per-list, or even per-user basis. - Users can now change their digest delivery type from MIME to plain text globally, for all lists they are subscribed to. - No language select pulldowns are shown if the list only supports one language. - More mylist-admin eradication. - Several performance improvements in the bounce qrunner, one of which is to make it run only once per minute instead of once per second. - Korean language support as been added. - Gatewaying from news -> mail uses its connections to the nntpd more efficiently. - In bin/add_members, -n/--non-digest-members-file command line switch is deprecated in favor of -r/--regular-members-file. - bin/sync_members grew a -g/--goodbye-msg switch.