Today, at Dreamforce 2009, Computer Associates plans to release CA Agile Planner(http://www.ca.com/agile), a tool to manage agile development teams.
CA Agile Planner will be integrated with CA Clarity PPM (http://www.ca.com/ppm).
Although it was not clear how much of the demonstrated app will run on Force.com and how much will run on the CA servers (though it appeared to be 100% on Force.com), it was clear that the application was accessed via a force.com URL.
For more information, see http://www.ca.com/agile.
A release date for the product was not mentioned, but the earliest planned release of any newly-announced feature thus far is Spring 2010, so one might assume that this will not be available until then.