The GUI and functionality should be made as flat as posible. Hieracical structures (many submenues, deep task trees or forum threads) often makes the GUI less intuitive and also more cumbersome (more clicks). The information is also harder to extract easily. My initial feel is that the pp has to many levels and hieracies. I would take me 3 click just to get to the task view where I have to start clicking on subtasks again just to get the information that I need, easily ending up in 5-6 clicks to see the task. Features that can make it less hierarical are:
search for all content (like gmail)
extended issue feature that integrates milestones with issues (see feedback on TODO list).