Yahoo just launched a new advertising tool called SmartAds. The tool takes personalization to a new level by allowing marketers to deliver ads that are more relevant to the viewer.
An example from the CNET article helps illustrate:
For instance, instead of just seeing a generic ad for a Toyota Prius, a woman in San Francisco who conducts research on hybrid cars on Yahoo Autos could be served an ad for a local San Francisco dealer, along with information on the types of Priuses in stock and their purchase price. The ad, which is configured on the fly, could also feature a background color targeted for women in her age range, as well as a Golden Gate Bridge logo.
Initially the ads will appear on Yahoo's publisher network but will eventually show on partner sites like Comcast and eBay.
For more information check out the full article.