Web/Load Testing
The following blog post will discuss access methods in data sources and what happens when you run a load test on multiple agents.
http://blogs.msdn.com/slumley/pages/description-of-access-methods-in-data-sources.aspx
Check out this great post by Ed Glas for a lot of valuable information for debugging web tests: http://blogs.msdn.com/edglas/archive/2007/12/02/web-test-authoring-and-debugging-techniques-for-vs-2008.aspx
The sample reports I put together have moved to http://www.codeplex.com/loadtestreports/. We also started a codeplex project which will provide additional extraction/validation rules: http://www.codeplex.com/TeamTestPlugins.