Yes, those are good fragments of information (the irc channel log is also useful) but there is unfortunately still no "100000feet overview". I know the devs are busy implementing but I still think it would be a good investment to spend 2-3 days documenting the big picture, describing the key systems and interfaces etc.
With a solid backbone for the docs, I'm sure there are enough curious people willing to explore and document. Before you know it everything will be documented, lots of people know enough of the AS to start fixing the bugs themselves and then you can start recruiting! ;)