jfruh writes: For years, paid links returned from Google search queries have been set off from 'real' search results by their placement on the page and by a colored background. But some users have begun to see a different format for these ads: a tiny yellow button that reads 'AD' at the end of the link is the only distinguishing feature. Google is notoriously close-mouthed about this sort of thing, but it may begin rolling the new format out to more users soon. 'Does Google want to increase its click-through rates as much as possible? Yes,' said a VP at one digital marketing agency."