Although I've been experimenting in Swan Bros with Google Adsense for content, Adsense for Search, Chitika, Kontera and Widgetbucks, I've never tried "Competitive Ad Filter" from Adsense at all. I've noticed the function a long time ago, but I thought it was just to block ads from your competitors.

Recently I did some research about avoiding low CPC ads, I found out how "Made For Adsense" sites are stealing traffic & revenues from genuine bloggers with their low CPC ads (too late, you might say :-p). That's how I found out AdsBlackList.com and without any hesitation I joined it, and got the list of black listed sites(MFA and low CPC) for my keywords. Then I activated "Competitive Ad Filter".

It's been only one day, so it's a bit early to say how effective it's. But I'll keep you updated with my success story (hopefully).

How about you? How have you been coping with low CPC ads?