I did some looking into this myself. Drupal looked interesting, but the solution that seemed simplest and best to me was using a phpbb and a mailman <--> phpbb gateway.
There are more advantages a drupal solution would have, namely a proper issue tracker / project management thing (have a look at http://drupal.org/project/issues). Also there's a CVS deploy module, so maybe in the long run it will be possible to integrate the main winehq.org site, the mailman lists and the bug tracker into one drupal thing (also, phpbb can be integrated.. but the Drupal forum is way leaner and of course can be styled with CSS to be inline with the winehq.org corporate design) However migrating in a single step is probably not very clever, so let's just bring up here if we manage to produce something that works.. I'll report back, too, once I've migrated those modules to drupal 6 and got it to work properly. regards, marcel.