We’ve been working with some MSIT teams for many months on our integration between TFS and Project Server.  They started dogfooding it as soon as we could say “it’s working” with a straight face.  They’ve now run multiple projects with it and they’ve given us a ton of feedback.  We’ve incorporated much of it in our final release.  They’ve now released a case study documenting some of the benefits they got from integrating TFS and Project Server.  You can read more here:

http://www.microsoft.com/casestudies/Microsoft-Project-Professional-2010/Microsoft-IT/Microsoft-Team-Cuts-Status-Meeting-Time-by-90-Percent-and-Improves-Information-Access/4000009358

Brian