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Early testing showed that enhanced sitelinks could make ads that appear above the organic search results even more useful. And they could lead to significantly higher clickthrough rates for an advertiser than regular 2-line and 3-line sitelinks.
Over the last several months, we’ve continued to improve the ad systems for creating enhanced sitelinks and determining when they’re most useful. Now, we’ve begun to roll them out in all countries where AdWords is available.
Google AdWords Rolling Out Enhanced Sitelinks Globally [adwords.blogspot.co.uk]