God I hate this on About.com. They're almost always the first result when I search for something, and every link on their page goes to another About.com page. And none of them have the information I'm searching for. I've added them (along with all of gawker media) to my hosts file.
One of the neater features I've seen Google implement is that if you click a link and then hit back within a short period, a little link shows up next to that search result that says "hide everything from about.com?"
