I definitely like the idea, but there are some logistical pros and cons to be weighed and, of course, no singular best solution... The search function turns up a bunch of crap to sift through more often than not for me, though I do try to use it before asking stuff. Most recent example: I tried "MP3 J Costa" and returned plenty of hits where the MP3 was only passingly mentioned somewhere within the thread while the main topic was about another model.
Copy & Paste works well for consolidation but makes one person in charge of content/what he/she deems is relevant within the discussion, and requires a LOT of maintenance by the original poster (or Admin... who have other stuff to do...) This style, while being concise in individual titles, also lends itself to multiple threads of different FAQs which can clutter up the sticky section at the top of the page so that it eventually gets largely ignored...
A consolidated "link thread" -where topics are well- described in the first post and then discussions are linked to, may require a few edits before they're "just so", but not as many as a copy/paste type consolidation. Though this will have folx resurrecting old topics and bumping them to the first page of the forum, that's not necessarily a bad thing and it seems to be the way most owner/admins of php boards seem to go... Members can read all sides posts on a certain topic and you then have just one thread stickied at the top of the forum instead of several threads addressing individual FAQs.
I was sort of toying with this idea but it takes a good bit of homework and time to get set up initially and right now all of my "downtime" in the evenings is spent either "practicing" on the MP3 *ahem* or taking on Tiger Woods on the Wii.
Simon, if you choose to take this task on/beat me to it, bully for you! And thanx! 8)