The Curse Client (http://www.curse.com/client) software has ads in the bottom right corner of the app.
Ad Muncher definitely used to filter these, but having just fired it up for the first time in 12 months, I'm finding that it is not filtering the ads anymore.
In my Filter Targets list I have "+curseclient:*"
Am using Ad Muncher v4.94.34121/5559 (Free) on Windows 8.1 x64