Mike Swanson has a great post about using CruiseControl.NET with MSBuild. It includes details about unit testing, FxCop, and how to coerce CruiseControl.NET to use MSBuild.

If you're lucky enough to be developing in .NET 2.0 and Visual Studio 2005, and want continuous integration, you should check this out.

By the way, Mike is the one who convinced me to start using CruiseControl.NET, as well as NUnit for testing our system. He's a very sharp guy, and it's nice to have him in our office. You can sponge a lot from him just having him around!