[Hoff]

The main thing I get from this discussion is the idea of viewing sub-projects in the left-hand pane - probably with a flip-arrow, like tasks and folders.

But when I think about it, I quickly run into some ugly UI. How many levels would you display there? If it displayed all of the outline except for individual tasks, we've pretty much duplicated the entire righthand UI in the column on the left - which isn't useful.

At what point do you distinguish a "sub-project" from a "sub-task?" (Or is that even a meaningful distinction?) Would the feature needed be being able to set as a preference, or by project, how many layers to display in the Project column? Maybe being able to Focus on a parent task in the task outline on the right?