Planning and coordination of projects and project components lend themselves to a collaborative web solution.  Do it, do it, done is a free web service to create and manage to do lists.  No registration is required - all that you need to do is remember the key to get back to your list!

http://www.doitdoitdone.com

Of course, a collaborative calendar would be a nice addition to display tests, assignments, and other due dates.  If you are using any of the other collaborative environments, they probably have an integrated calendar and that would be a better place to host a calendar.  But, if you want just a calendar...

http://www.whichtime.com/

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