I too have seem forums that use that style, however, I find them overly complicated to navigate.
Take, for example, ADSLguide.org.uk.
There forum, deals with broadband issues, both with providers, hardware, software, telecomms and anything else you can think of related to the use, setup and complaints of broadband.
While they have a forum for each broadband ISP in the UK (the list is long, and complicated in itself), this is required, to seperate threads, to there correct location, and as such, is justified.
However, when it comes to FAQ's, they have produced 2 or 3 sticky threads on the top, of the assosited forum.
If you ever read these, they are rather awkward to navigate, take a while to locate the details within the thread and look a complete mess (most of the mess is due to the creator, but even so, a tidy up would still prove hard to navigate).
Looking at another forum, for the EMPEG in-car MP3 player (proud owner of)
here.
They have a seperate forum (like here) dedicated to FAQ's.
It all depends of the size of the subject, how it should it navigated and the naming process.
Using a seperate forum for it, you are able to place the error message as the subject, and discuss the issue within the thread.
While this is simple enough for threads that have been moved from the Tcl forum, it's just not sane for some topics.
IE, a thread may go too far into the discusion or off-topic. It may also be too scattered to recgonise the answer.
Taking this, the first post in the thread should be updated, to reflect any issues regarding the answer provided, rather than scattering it over 6 posts, where a reader has to get into the conversation themselves to locate the answer.
There may be a time, where it is shown that a reply to a FAQ, is ralted to the original FAQ, but is too deeply related to a specific scenario. Under this condition, the first post int he thread, should cover the main FAQ at hand, but replies to cover the times of deep scenarios.
IE.
Deeply nested lists (list, within list, wihtin list, without list, within list (cheesy, but understandable)).
Socket errors. What other reasons bar the actual code could be causing the problems.
If there is no way, that a topic has a need to be replied to (IE, a discusion on why puthelp should be used in place of putserv), then these threads can be locked by a moderator.
In all, this provides a easy (maybe a compromise) way to navigate FAQ's, with the ability to get feeback and cover the topic in more depth, with the advantage of not having the topic being cross posted to the Tcl forum, for replies.