Tech.It.To.Me->{By.Anton.Perez}

It’s a tool that provides you an easy way to simulate large numbers of users against your web app, which makes it possible for one to make intelligent decisions about hardware and software load incurred by your application and how much traffic a given machine or group of machines can handle.

In case you need to gauge the performance and load capability of your servers and its application(s), give Microsoft’s Web Application Stress tool a go.