Cunc-
The short response to Erik's reference for email over a BBS is essentially that for a power-user, with the talent, knowledge, and time to configure and use "good email clients" which make "quoting and threading transparent and easy to use", email is preferable.
The reality is that is not the case for most people.
While I agree that most people aren't "power users", most people are familiar with at least the basic functionality that their email client offers. So I do not see the "barrier to entry" you see. If someone cannot follow the instructions "reply to this email to confirm your subscription", it is questionable whether they can participate at all.
The more important reality is that there should not be an additional barrier to entry in finding and using the discussion forum (currently in email form) above the barriers to entry to becoming a Wikipedia editor (which are web access, going to Wikipedia, clicking on "Edit this page" and possibly creating a user account).
The mailing lists are for policy nerds, techies and masochists. Article- related discussions already take place on the respective talk pages, and for user help there's the Village Pump. I've already stated that I agree the discussion system on talk pages needs improvements - give me money and I will fix it.
Another basic, basic thing: since we're discussing Wikipedia matters, we really should be able to make links to Wikipedia entries in the discussion forum. We can't usefully do that with email.
http://www.wikipedia.org/wiki/The_Hitchhikers_Guide_to_the_Galaxy
Do you see an URL above, or has the string been magically converted into noise by your email client? What seems to be the problem?
But instead of having the argument about why a BBS would be better than an Email list, I recommend setting up a BBS, and letting practice decide.
Not necessary, the arguments against a BBS are sufficiently strong. The last thing we need is another forum, even if it's just experimental.
Regards,
Erik