For anyone who plans to set this up on a site that gets moderate traffic, here's an example Raven config that helps weed out exceptions caused by 3rd party scripts and browser extensions:

https://gist.github.com/impressiver/5092952

I initially set up Raven without this ignore list, and we drowned in exceptions caused by shoddy browser plugins and userscripts. On the flipside, sifting through those logs did help to explain a few unreproducible support tickets.

Hope someone finds this of use!