New Fiddler Betas
Both releases include a number of minor bugfixes, and the first basic implementation of the AutoResponder tab, which allows easy manipulation of HTTP requests using locally-altered files from your \Captures\Responses folder.
Fiddler2 also includes the first basic support for the IAutoFiddle interface, a new extensibility model that enables powerful extensibility via .NET; IAutoFiddle will eventually allow you to create drag/drop libraries of manipulations that can easily be shared without manipulating your Custom Rules file. Expect to hear more details about IAutoFiddle over the next few months.
Thanks for your continued interest!