Here are the changes:
* The ads displayed at the top of search results pages for highly competitive keywords have a background (#FFF9DD), instead of a blue background. The new background is so subtle that is almost white and many users might confuse them with the actual search results.
To prevent accidental clicks, "users now need to click on the link in the top line of an ad in order to be taken to an advertiser's site," according to AdWords blog. Until now, you could click anywhere in the ad box, including the blank spaces.
* AdSense ads change the famous "Ads by Gooooogle" branding from a text into an image that contains Google's logo. "After extensive testing and research, we've found that the new formats are not only visually appealing to users, but they also perform even better for publishers and advertisers," explains Leslie Chiang.
