I find myself applying the same filters again and again on each launch of Fiddler (I mean the filters listed below the list of requests).
I think it would be really great if you could allow the restoration of previously applied filters (e.g. by having a save/load filters option).
Also, allowing to filter out by "Request Method" would be great too.
Congratulations on this tool, by the way.
It is really great. :)