It looks like the forum page is used as a last resort, and not something that people will use as general place for usage discussion. Are Google groups web forums? I'm basically looking for a place that hosts those gnu/mailman mailing lists.
Google Groups has a web interface but it also functions like a mailing list and subscribers can set the type of delivery that the want such as Full, Daily Digest, Weekly Digest, etc.
It also has nice built-in searching (as you can imagine :-)) and posting stats and management. Here is one of mine.
It works for me but you may prefer a real mailing list.