Information on MSFAgile as featured in VSTS
http://lab.msdn.microsoft.com/teamsystem/workshop/msfagile/default.aspx
Don’t forget to download http://www.microsoft.com/downloads/details.aspx?FamilyId=9F3EA426-C2B2-4264-BA0F-35A021D85234&displaylang=en, a lot of info on the complete methodology, and how it is supported in VSTS.