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I don't want scuba diving ads on my widget site. And even if the user has only a passing interest in widgets, he's on my widget site, clearly looking for widget information.
Maybe the plan is that if there are not enough widget ads to go round then scuba diving ones can "reasonably" be served?
I do hope Google get this right but I have doubts. Time will tell. But I'm not sure that I like the idea of "interest" based ads being served on my pages. I will no longer have any idea what ads are being served. Imagine if the user has an interest in latex clothing!
"Most browsers are initially set up to accept cookies, but you can reset your browser to refuse all cookies or to indicate when a cookie is being sent. However, some Google features and services may not function properly if your cookies are disabled.
Google uses the DoubleClick advertising cookie on AdSense partner sites and certain Google services to help advertisers and publishers serve and manage ads across the web. You can view, edit, and manage your ads preferences associated with this cookie by accessing the Ads Preferences Manager. In addition, you may choose to opt out of the DoubleClick cookie at any time by using DoubleClick’s opt-out cookie.
You can decline to submit personal information to any of our services, in which case Google may not be able to provide those services to you."
What if my website displays "behavior triggered - cheap ads" and my website normally offers "content related - expensive ads", both of which are of interest to the user... Could that damage Adsense income?
sensitive interest ads will not be served
"Google will not associate sensitive interest categories with the DoubleClick cookie (such as those based on race, religion, sexual orientation, health, or sensitive financial categories) and will not use these categories when showing you interest-based ads."
The Google-wide team working on this has put a lot of hard work into this launch, and I personally think it's great news for publishers, advertisers, and users.
* Google's use of the DART cookie enables it to serve ads to your users based on their visit to your sites and other sites on the Internet.
You can find additional information in Appendix A of the NAI Self-Regulatory principles for publishers [networkadvertising.org] (PDF). Please note that the NAI may change this sample language at any time.
Naturally, there are very good reasons why publishers should not do that. As for the behaviorally targeted Adsense Ads, why not just inform the visitor of how it works?
Thankx ASA - you beat me to it, with a much better solution.