Well, basically the subforums is a good idea, but I feel it may lead to fragmentation of APUG as a whole. And going through 40 subforums don't appeal. As for splitting the Film, Paper, Chemistry forum into two or three (sub)forums: many of the questions are related to each other, like what film to what chemistry and so on. On both RFF and the LF forum, they seem to have gone in the other direction, less subforums. Larger forum groups seems to make for slight confusion but also a lot of healthy crossbreeding.
Whatever, don't go bananas with the forums, that's my take.