A new case study just went live which details how Telemar adopted Visual Studio Team Foundation Server and Visual Studio Team Suite. Telemar's main challenge was that they outsource all of the programming for their software projects, but Telemar employees still must project manage everything centrally. They were looking for a solution which would enable better collaboration between Telemar employees and vendors, as well as a way to collect rich reporting and implement project governance to minimize project risk. They chose Visual Studio Team System and are in the midst of deploying the solution to thousands of developers. You can read more here.
For a list of some other Visual Studio Team System case studies see Grace's blog.