Orca

Orca is a new concept in forums developed for Web 2.0 with AJAX technology.

One of the most attractive aspects of this forum system lies in its new concept of administration: using Orca, the users themselves can be in charge of running the community.

So, managing posts and messages doesn't require you to have an official forum administrator, since a group of users can do it themselves using votes to determine the importance and popularity of each post.

Another interesting feature allows you to follow discussions using any feed reader, as it accepts RSS syndication.

Finally, Orca works like the majority of current DBMS, so you won't have any trouble getting it up and running.