Have you heard of OSQA yet? It is an Open Source Question Answer System.
Somehow it like a forum, but to be honest, it is not. Why am I blogging this? This very tool is being used by LibreOffice: Questions – Ask LibreOffice. It is not populate and there will be a forum (no warranty) to, so don’t worry.Will you use it? Do you think it is perfect yet, or don’t you?