Some of how-to threads that I started actually began as wiki pages, and were moved to the how-to forum after I felt like they were done. I actually like this approach a lot, because an interesting thing happens when I move something from the wiki to the forum: people actually read it!
Most of mine have had updates made in response to things people wrote in replies to the threads, but none of them got any feedback while they were on the wiki. The forum is a great mechanism for getting feedback and incorporating it quickly, because the article and the feedback are all on one page - but there's different buttons to edit the content, post feedback, and post responses to feedback. So it all stays nicely organized and it turns into a document plus a conversation. I like that.
There's a new one in progress on the wiki right now actually. I can work on it when I want, or ignore it when I'm busy, and there's no pressure to finish it, or questions about half-baked stuff that I'm going to revise later anyway. It's all about discoverability - everyone reads the forum, but hardly anyone reads the wiki. That works really well for drafting (on the wiki) and publishing (on the forum).
