The % complete graphic is great. However, this only shows finished tasks.
On a similar basis it would be good to have a graphical representation for each project of:
a) The number of tasks
b) the age of the tasks
c) the progress of tasks moving through the "list"
d) number of missed deadlines.
the "age" x "task volume" product could be used to create "temperature / velocity" indicator of the project. (low temperature / low velocity meaning lots of old tasks that have not completed or moved up the list)