There is a SharePoint 2010 Developer Training Course over at the Channel 9 Learning Center .  There are a few places where I tweaked things a bit to make it work the way I wanted.  One of the labs is a LINQ to SharePoint lab. It has two parts...

If you’d like to see what an occasional test response looks like in your load tests, you can turn on test logging.  That saves the individual test responses—you get unit test results for unit tests, and web performance test results for web performance...

You’ve been able to parameterize web servers in web (performance) tests since 2005.  When you do this, it sets a context parameter that you can update to retarget to a different web server. Well, you can take advantage of that in load tests. ...