Do you ever find yourselves needing to know what goes on inside and HTTP session? You could use a packet sniffer but doing so requires a lot of work reading packets. Fiddler is a tool that makes the process a lot simpler. It's an HTTP debugging proxy that you run on your desktop, where you can fiddle around with the data going in and out of your system. There's also a dev blog for Fiddler, and more information at MSDN .