Twice at MEDC speakers mention an HTTP Debugging Proxy named Fiddler and it appears to have been created and is maintained by a company called Microsoft.
Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler is designed to be much simpler than using NetMon or Achilles, and includes a simple but powerful JScript.NET event-based scripting subsystem.
Click to install Fiddler v1.1