For a while we experimented with a bulletin-board discussion site (running on phpBB) at http://boards.wikimedia.org/ This hasn't been used since August as far as I can see.
A serious security vulnerability has been announced in phpBB recently; rather than add to our maintenance burden for an unused site I'm taking the boards offline. If there's a sudden demand for it, we could upgrade it and put it back online.
-- brion vibber (brion @ pobox.com)