the Arduino documentation is extremely good. Could you please show me any other platform with a similar amount of resources and documentation?
I think your statement that the documentation is poor might stem from a misunderstanding of what arduino is.
I agree that there is lots of space for improvements. However, as cr0sh has mentioned - this is a process and jumping in, requesting a clear cut like you are doing is not especially helpful. Also, the number of individual forums is actually something which sort of came about out of experience with the old forums and to somebody who has been around for a while it makes sense. (I mean - comparing it to before when we had less sub forums, this is a much better solution.)
Having said that - I too would welcome a tagging/filtering system. I suggest we continue the discussion on that topic here: http://arduino.cc/forum/index.php/topic,158153.0/topicseen.html