Google announced subtly that it is rolling out a series of enhancements to AdSenses contextual targeting capabilities to more accurately match relevant ads to AdSense publishers pages.

Unfortunately, not many details about these enhancements were given away, but Google says AdSense publishers will not have to update their AdSense accounts or ad code. Changes will be applied automatically. Our machines are very good at the matching process, but there are still a few cases where their definition of relevance differs from our human definition of relevance, says AdSense Product Manager Woojin Kim. In these few cases, the system might end up serving ads that dont seem immediately relevant to users.