Yahoo! recently announced a program called Smart Ads.

Yahoo!’s New “SmartAds” Meld Brand and Direct Response Advertising
Innovative, Patent-Pending Ad Delivery Platform Allows Marketers to Present Highly Targeted Online Display Ads in Real Time to Match a User’s Distinctive, Expressed Interests

That is, the ads will be more relevant to the content of website, know where is the visitor from etc.

Well, recently steve baldwin came across something interesting ..