Ever since the launch of Google AdSense, AdWords advertisers always wondered which sites their ads were running on. Google added opt out methods; to opt out of the content network and later to opt out of specific sites. But they never showed you a list of sites your ad would appear on.
That appears to be changing. Jennifer Slegg wrote Google AdWords To Show Advertisers Exactly Where Their Contextual Ads Are Displayed at Search Engine Land and has more details at her blog JenSense.
She explains that a New York Times article from Kim Malone says "Google will begin listing all publisher websites where AdWords advertiser's ads are being run."
In the next few months, Google’s advertiser reports will begin listing the sites where each ad runs, Ms. Malone said. She added that advertisers on the Google networks would soon be able to bid on contextual ads on particular Web sites rather than simply buying keywords that appeared across Google’s entire network.
Overall, most AdWords advertisers are thrilled. I suspect some AdSense publishers are not.
But I think this is a great move by Google. Who knows, maybe some of the large competitors will beat Google to implementing this?