Google's making some changes and doing something called "interest-based advertising" wherein they'll use your cookie to put you in a category depending on the Google sites you visit such as "gamer", "sports fan" etc. and then alter the AdSense adverts to reflect that.
I have two on the site, so feel I should pass on what they've told me to:
- 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.
By the way, I make pretty much nothing from the adverts, but it's a nice little experiment I feel.