List of discussion boards?

I'm trying to find the most comprehensive list of internet discussion boards possible.
bigboards only lists forums with 500k+ posts and I need a list of forums with less than 500k.

Anyone have any ideas?

Thanks.

 

I have a list of 47 forum directories. One of them probably has a comprehensive list.

 

Thank you, I'll check them out.

 

I had built a list of directory forums couple of months back!

 

I think you may of missed the point of this thread.

 

This was in directories section, so i thought you were referring probably to discussion board of directory topic!
Apologizes, if it doesn't suit your question.