So I have been taking a look at Rational's Team Concert and their Jazz Platform for software delivery. The have a beta client out for Visual Studio and if you take a look at this demo you will see strikingly similar features as compared to Team Foundation Server. There is a session for this proposed for the Agile 2009 conference that I am hoping to make it to this year. It will be interesting to see this product demonstration and compare it to the VSTS/TFS feature set.