Could a place on the forum be dedicated to wikis? For example, each thread might be given a wiki thread. this might be used as a way of organizing information on the thread into a comprehensive document on the thread.
After threads grow to a certain size they start to become too large to navigate easily. A wiki would be one way to allow threads to easily impart the wisdom from a thread. (Perhaps a thread Wiki could link back to the thread, and a wiki might have an index of words linked back to the thread.)