I can't get into specifics obviously, but the ads appear to be directing to Doubleclick domains
I don't have any popping up on my site now that had it, but last night when they were, they were visual ads that were not of the Google type, and while they had a link to Google's servers (the first link in the URL obviously), the final servers in the link were Doubleclick domains and styles as I said were Doubleclick style. It's hard to describe unless you've run both.
It could be simply Doubleclick tracking somehow, but it's weird that I've never seen it before and it definitely acted like Doubleclick when I've used Doubleclick in the past, and the code was not of the normal Doubleclick trackign code.
It was also weird that other than the google link in the first part of the URL, there was nothing else identifying it with Google. A person seeing it would not see anything related to Google.
I checked some of the advertisers, and they appear to be focused on Doubleclick as well.
I would have more information, but I didn't feel like clicking on my own ads, and so just had to settle for looking at the links and the domains that were passed.
I could very well be wrong, but even if they are Doubleclick, I'm not going to complain as long as my revenue is solid and I get paid on time :-)