I was able to attend the session by Moshe Weitzman titled "Fully baked wiki module for Drupal". I don't get too exited though, because we still don't have one yet. This session was about getting together and working out requirements and an action plan for creating one. There should be a group up for this soon so be sure to keep checking the drupal groups.
If you're looking for wiki functionality in Drupal right now your best options are the following:
The Liquid wiki module. This hasn't been updated for a number of months, and may require some finessing to get it working. Bryght also has some ideas using the freelinking module and doing some other configuration to create a wiki like functionality. Check out the Bryght Wiki for more information.
Neither of these solutions are ideal, but they might get you started if you can' wait.