The latest version of WCAT (Web Capacity Analysis Tool - the web performance test tool that the IIS team and NT Performance team use to conduct internal performance and scalability testing of IIS and ASP.NET) just released . For more details and download, read: http://mvolo.com/blogs/serverside/archive/2007/05/17/WCAT-6.3-web-performance-and-scalability-test-tool-released.aspx .