In working on a support option for drupalcommerce.org, I just discovered Shapado, a FOSS stackexchange clone. I'm going to experiment with it. It's not Drupal, but do we have to use Drupal, or can we just use something that works well?
As we've already noted, drupal.stackexchange.com works fantastically, but of course we have limited control of the site, no way to integrate standard external (to stackexchange) resources into it, and no control of the future of the content.
