Date: 01/16/07 (Java Web)    Keywords: yahoo, google

Google AdSense is known for its uncanny relevance in serving context sensitive ads. Its competitors like Yahoo Publisher Network and Kontera aren’t being able to make significant inroads to AdSense / AdWords customer based primarily due to relevance, perceived or otherwise. However recently I am starting to see completely irrelevant ads as far as contextuality. [...]

Source: http://blog.taragana.com/index.php/archive/is-google-adsense-losing-its-relevance/