tangor - 9:38 am on Jun 22, 2010 (gmt 0)
Sounds like you've got all the bells and whistles in place.
What about the content? Unless the subject/theme/members are general in nature it will be difficult to grow a forum beyond a handful (heck, one of my forums only has 94 members!, the rest are 10k up).
The folks who will post will only do so if they are interested. And folks who post are generally 10% of the lurkers/readers.