Another tool found it's way into my inbox today from Eric Lawrence-

Need to monitor or modify HTTP traffic? Try Fiddler.”

From the site:

http://www.fiddlertool.com/fiddler/

Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to watch HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler is designed to be much simpler than using NetMon or Achilles.

Josh