I just realized: with the new forum layout, per-forum sticky threads will be much easier to miss, since there's no reason to visit the individual forums. So for example people posting questionnaires in general talk will be even less likely to see the "don't post questionnaires" sticky.
Maybe something can be done on the non-forum specific "start a new thread" page, so that upon choosing the relevant forum from the selectbox, links to all the stickies for that forum will be shown? (Then again, on General Talk that also brings up the "travel unravelled" threads, and on Off Topic the movies, book club and Foundation threads, none of which contain "read this before posting" information... But maybe the Sticky flag can be split in two: one for "notices" (to be loaded on the new thread page) and one for more temporary stickies.)