The eScrum 1.0 project management tool has been released for Visual Studio Team Foundation Server. It provides for a repository for all Scrum artifacts, such as product backlogs, sprint backlogs, task management, retrospectives, and reports.
Scrum is an agile methodology that provides for an iterative process for developing a product and managing the work. When using Scrum, you have potentially shippable functionality at every interation.
The tool is available on the Microsoft website at http://www.microsoft.com/downloads/details.aspx?FamilyID=55a4bde6-10a7-4c41-9938-f388c1ed15e9&displaylang=en
There's additional information about Scrum, how it works, how to prepare, the roles of the participants, artifacts that are produced, and a FAQ at the Scrum for Team System site.