list sub-forums under description of forum

[md_doc]

Okay this seems to fall into this thread but if it is the wrong forum I appologize in advance (I have spent 10 minutes trying to figure out the best forum to post to).

I notice on http://coderforums.com , http://www.christianguitar.ws/forums/ ,and http://www.sitepointforums.com (although this one is 3.0.0 beta) that under the forum's descriotion they have a list of all the sub-forums under that forum. I have search this site with the terms sub-forum, sub-forum modification, sub forum, hack, and everything else I could think of and I cannot find out how to get such a thing to work.

I figure since I find it on more than a handful of sites that someone here might know where I can find the hack.

Any help would be greatly apprechiated.

thanks
md