Fiddling with Fiddler
Fiddler is a HTTP Debugging Proxy tool which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.
Important Links:
Get Fiddler
Addons
Video Tutorials
Fiddler can be used with non - IE browsers also by changing proxy settings on browser.