Visual Studio Team System

Yes - you can use WatiN and Visual Studio Team System!  Simply create a brand new Unit Test within your project and use WatiN within the test methods.  The only catch is if you get an error that looks like this : 

The location of the file or directory ___ is not trusted.  To resolve this I needed to right click on BOTH WatiN.Core.dll and Interop.SHDocVw.dll and click the "Unblock" button at the bottom.  After that I needed to rebuild my project before the tests would run.

In doing performance testing it is extremely common to encounter situations where your test scripts need to choose a specific link on the page based on some condition.  For example, consider the following table: