In IIS 7, I would click on \"worker process\" then \"View Current Request\" to see all the requests currently being executed.
http://technet.microsoft.com/en-us/libr
This show's the steps to install it. From https://portal.ektron.com/KB/10396/:
To run it after it's installed you will need to find the "Worker Process" icon on the server settings in IIS Manager.
Another good option with ASP.net is to go to task manager, right click on the process and select "Create Dump File" then download and double click on the created .dmp file to load it into Visual Studios debugger. Then look thru the threads and their call stacks to see where all the requests are being executed. This method allows you to see exactly what the requests are doing (infinite loops, deadlocks, etc.)