James Newkirk on Why Unit Testing in Team System

James Newkirk on the unit testing in Team System debate:

Why unit testing in Visual Studio Team System - Again

There are a number of questions that come to mind for me with this issue. Why is unit testing singled out? What about the other tools, like source code control, and static analysis, profiling, etc? Certainly these tools are valuable during development. So, that said why focus just on unit testing? Since nobody answered, I will jump in. :)