James Dawson previously posted a plugin for CruiseControl.NET that provided a continuous integration facility for TFS 2005, which I mentioned back in August. He's now set up a CodePlex project for it: TFS TeamBuild Task for CruiseControl.NET. You can get both the binaries and the source code from the CodePlex project.
Continuous integration is now built into Team Build 2008. However, for those who have to continue using TFS 2005 for a while, projects like this provide a way to fill the gaps.