CNET: Google preps new tool to juice revenue

Google is preparing to launch a complementary technology to its contextual ad program, an engine that will determine what lists of keywords will be most likely to trigger a visit to an advertiser's site. Google hopes that the technology will help increase the value of those clicks, and therefore the ceiling of their pricing, as well as include more searches in the ad program. Currently, only about two out of five searches on Google are linked to these ads.