Recently a Tidings entry has been published to the effect that it has been created a permanent "bulletin board" where they post requests for new tutorials: Tutorials Quest. Now another such board, although in the form of a more regular thread, that springs to mind is the poll ideas quest linked to from the The Monastery Gates themselves, and an even more regular thread that it is somehow "neverending" (no one really is, in the sense that they don't get "closed" after some time) is the nice one about the PM community itself: Name Space.
I'd also like to know about other ones...
Thus I wonder if there's any official or semi-official list of such threads or "boards", ranging from the most technically oriented to the ones optimized for fun. Personally, the first place I would have looked into, and I did, is The Perl Monks Guide to the Monastery: but there's nothing there in this sense. Maybe it may be added.