Mitch Denny blogs about a new utility for providing continuous integration on TFS (Getting Started with TFS Integrator). This utility uses .NET Framework 3.0. See Mitch's post for the details on where to get it, and how to configure it.
As you are probably no doubt aware, Team Foundation Server does not ship out of the box with a Continuous Integration capability. A lot of people, including myself consider this a glaring omission - but as a developer I have to appreciate the demands of tight delivery schedules.