Ralf and Mary, many thanks for your comments.
As suggested, I have moved the Teaching tips forum to the Getting started section. It would be good to encourage more teacher discussions, though I wonder whether these days people prefer to discuss pedagogical aspects elsewhere on the Internet, such as in communities of practice on a hub?
The usability forum is similar to the accessibility forum in that it has a very mixed collection of posts with many left unanswered. I think we should be getting rid of any forum in which there is confusion about what exactly should be posted there and where there is hardly anyone replying to posts.
Regarding the Moodle community sites forum, I thought this could be the place for comments, feedback, suggestions etc about any of the community sites, including the school demo.
Regarding where to post unofficial hacks, aren't these usually posted as answers to questions? Perhaps they should be added to Moodle Docs, rather than creating a forum for them.
Just noting a few comments which came up in a recent moodle.org HQ meeting:
Several people thought that the security and privacy forum should stay, and Dan offered to moderate it.
Martin recommended that I write up a forums policy explaining the logic behind the list of forums, how we decide whether to create a new forum etc.
Martin also came up with the following suggestion for consideration:
a new course format with two tabs at the top, so you can switch between them... one tab says "forums", and one tab says "recent activity" and the recent activity tab could be like http://moodle.org/course/recent.php?id=5 or improved.