Jen has news of a beta test that AdSense is running with a select number of advertisers where they will be working with a number of third party ad providers to serve ads on their publishers site.
The details are a little unclear at this point with regards to which third parties will be involved but it seems that the ads will be image ads. The email that AdSense are sending publishers starts:
‘As part of our efforts to continually improve the advertising experience for our users, advertisers, and publishers, we wanted to inform you that over the next few months we will be testing new ways to serve ads to your site. Specifically, we will be running a limited number of site-targeted campaigns that will leverage 3rd party ad-serving/tracking technology.
As part of the test, you may see an increase in revenue as a result of advertisers selecting your site for site-targeted campaigns…’
Read the full email and Jen’s comments at AdSense beta testing third party tracking in image ads