I think a question to consider is exactly how many memorable threads the community could come up with (memorable being so vague as others have said), and whether that number is large enough to constitute a forum dedicated simply to these 'memorable' threads.
JCF is a somewhat active forum, but I think it's fair to say the bulk of the posts and threads here are less than memorable simply because they are pretty much random and disjointed and truly great threads are few and far between, most of them ancient.
I don't mean to say "There are no good threads here," only that I'm not sure there would be enough 'memorable' threads to warrant a hall of fame. It'd be a pretty small hall.