Interesting move here by Telerik to acquire Fiddler.

http://www.fiddler2.com/fiddler/LetterFromEric.asp

http://www.telerik.com/automated-testing-tools/blog/christophereyhorn/12-09-10/here-we-grow-again-telerik-acquires-fiddler-what-s-next.aspx

I’m guessing they will integrate Fiddler into some type of testing framework.  I’ve used Fiddler a lot over the years.  It’s great for looking at the details of network traffic and diagnosing issues to do with HTTP of out of band requests.