I think it would be nice when you have task lists and tasks in a milestone to be able to either see them or have a quick link to them when you click on a milestone in the "My Calendar" view. It would be a nice shortcut in the interface.

And if I can add more : rolling over the milestone for a few seconds could show the list of tasks. On either left or right side of the mouse, you move your mouse in the panel and click to make it "fixed". Once fixed you'll be able to close it by clicking outside of it or with a X icon on the top.

This way I could stop having tons of tasks in My Calendar view and regroup them. Which is the main objective of this idea ;-)