Recently I had reason to be very glad that I had Fiddler. I was able to record some web service traffic and identify a problem as Fiddler can record both the call to a web service and response from the web service. By seeing the actual data traffic I was able to resolve a problem found in testing in less time than it has taken me to write this blog entry!

This tool is also useful for studying general web site traffic.

Fiddler is available from http://www.fiddler2.com/fiddler2/

There are training videos available on the above site.