I'm going to try to figure out why subsites broke when Dave tried to make each project its own subsite (they broke logging in, but it doesn't break on my system here).
So the goal is subsite enabled, yes.
As far as splitting up discussion groups etc logically the 4.0 discussion groups would belong to the project but the group didn't do that. Whether or not they are, certainly they need summarizing on the main page and the forums page just like they're presented now in the new site design!
The thinking is more like each should have its own bugtracker ...
