IIRC, someone (was it AMK?) wanted to do a whole new archive web interface as well. I don't think it got real, though.
I am interested in a good mailman archiver as i am still looking for one for codespeak's mailing lists. However, i probably want something where i can stuff in source code, documentation, IRC-logs and mailing-list archives and have a nice search interface for all that (displaying search results in content-specific ways but just so that it reads nicely).