+3  A: 

Change the url to http://ipv4.fiddler:1066/GeneralService/sections/summary to enable fiddler to listen on localhost

Jon
+2  A: 

One neat trick is just to add a period(.) after the word localhost. No other config neccesary.

PortageMonkey
+1  A: 

See http://stackoverflow.com/questions/1577772/force-visual-studio-to-start-development-server-using-the-hostname-localhost-wi for the duplicate version of this question; that thread lists all possible approaches.

EricLaw -MSFT-
+1  A: 

You can use the integrated traffic monitor built into CassiniDev. It can be run stand-alone or as a direct drop-in replacement for VS 2008/2010 development servers.

alt text alt text

Sky Sanders