TFS and VersionOne
I am writing this from the Agile 2008 Conference. Michael Leeds from VersionOne informed me that they released their connector to TFS this week. Check out the details here. I am thrilled to see Agile partners building integration into TFS.
Update (8/29): Adding a link to the VersionOne's web page with details about this integration. (http://www.versionone.com/microsoftvsts/)