Storyotypes are stereotypes for user stories that can help to define the right scope for your user stories. You can read more about these in the article Using Storyotypes to Split Bloated XP Stories and these slides. Team Foundation Server 2010 includes a new VSTS for Agile process template closely following the Scrum practices and supporting a user story WIT. However, Storyotypes are not supported, so I decided to change the standard work item template to add that field. You can download the modified WIT template from here. You can install them into an existing project using the witadmin.exe tool (available if you open a Visual Studio 2010 Command Prompt), but it’s much easier to use the TFS Power Tools.
Updated on November 2nd, 2010 with a WIT template compatible with Visual Studio 2010 RTM.