I know this is really minor, but I think would help a lot of people (well, me).
In the Task view, if there is no Group By set, the title above the task list shows up as "Tasks". This left me scratching my head on numerous occasions wondering why my milestones had disappeared. Perhaps changing it from "Tasks" to "All Tasks" would be more accurate, and give the dumb user like me a clue as to the fact that their milestones are still there somewhere.
cheers