The nice part about most wiki software is the ability to roll back any changes. Plus, there are ways (similar to the registration here) to prevent just anyone from posting/editing stuff.
I got the software loaded and the site is up, but I wouldn't call it running.
http://www.groundtradeswiki.com
It's going to take me a little while to understand how this software works and to get it set in a way that will work for us. The level of complexity of this dwarfs that of the software GTX is run on, so I've got some learning to do.