In the modules database
http://moodle.org/mod/data/view.php?d=13&rid=497
you can get this block that generates a gantt diagram (like microsoft project) of all the assignments in a course.
It also alows to change the dates of the assignments and save the changes.
here you have a video on how it works
I hope you'll like it.
Assignment
Gantt diagram of all the assgnments in a course
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