Fiddler 1.0 - Web performance analysis & optimization

I first discovered Fiddler over a year ago after trying several other HTTP trace/proxy tools like YATT for tuning ASP.NET 1.0 applications. Although many of the other tools worked well, they often had extra dependencies or more complex UI's.  None of them quite matched the ease-of-use of Fiddler - especially with its IE integration.  Much has already been said about this tool on various blogs, so I won't repeat the typical praise and standard explanations. 

However, I just got around to downloading v1.0 and saw a link to an excellent article named "HTTP Performance Tuning with Fiddler".   This is one of the better explanations I have seen to give you a background on various web-tuning topics including a quick rundown on how the HTTP headers play a role in caching.    This is a must-read for any serious ASP.NET developer!

Note: If you are new to Fiddler, make sure to checkout this MSDN article to get started.