I just noticed a new article on MSDN which explains how to interpret the test results you get by running load tests with Visual Studio 2005 Team Edition for Software Testers (or "Team Test" for short).
Article: Monitoring and Analyzing a Load Test Result
If you are interested in improving the performance of your Web sites, these tools provide a great way for you to simulate user load and track down performance bottlenecks. I've spoken to several teams internally at Microsoft such as over in MSN and Live who are using the tools included with Team Test to identify and fix performance bottlenecks well before new code gets deployed to production servers. These teams are also reporting far better productivity actually writing tests, interpreting them, and issuing fixes than compared with their legacy testing tools.
For more Team Test content including videos, whitepapers, and Webcasts, check out these training resources.