i frequented another board which did the following, and it worked really well:
a subsection of the board was devoted to "How to...", wiki-type tutorials. Whenever a board member put together a really great tutorial regarding a certain procedure, the moderator put it in the tutorial section.
this works best if users can reply to the thread in the section but cannot start a new thread there. alternatively, the moderator makes those pearls sticky.
It's kind of like a hybrid between a wiki and a user guide.
