I'd not seen this kind of site hijacking before, perhaps it's been around and I live in a cave, but it still sucks.
I have a site called oldknowhow.com and I haven't been on there in a good long while, (One of those someday... type-projects) and decided I wanted to write a new article. Get on my Dashboard and I noticed that jetpack is reporting my top searches are coming from cosplaybay.com. I though to myself, that's interesting, I wonder what that is, so I check it out.
Well, it's my site loaded in an iframe and somehow they have managed to replace all my google ad code with their own, but still display my site in its entirety.
None of the iframe break-out plugins worked, none of my .htaccess tricks worked, but this code did!
I'm putting it into every site I own after this experience.