Sorry if this has been asked/suggested before but I can find no trace of it in the archives.
It's there -- I proposed to start working on it a few weeks ago.
The point about doing this with the archives is that this functionality is almost there already - it just needs a way of "on-server" posting to be developed. Since this could be limited to subscribers and can only go to the list then it is safe.
Actually, I administrate a web-based forum, and we have stronger needs -- user accounts on a per-system basis, for example, are crucial, and seem to be a popular wish-list item for Mailman already. (For those who have been discussing these, my co-conspiritor and I have been listening. A simple interface to Mailman accounts will be provided for easy integration with existing site accounts, and we're working on allowing logins under email addresses as well as user names.)
I've already got a simple web-based posting CGI script written -- I'm cleaning up the formatting and error reporting before I submit it. My friend has a user account system in place, but integration with the list subscription info is still too crude to submit.
(BTW, what's the best way for me to submit significant code changes? Since this is a GNU project, I imagine there are some legal papers to be exchanged. Also, do you prefer frequent submissions of sort-of-working code, or infrequent submissions of clean, working code?)
If you're interested in helping, let me know.
-S