Google Adwords Announces Ad Sitelinks

Google Adwords announced the launch of Ad Sitelinks today. What is it? Google states "Ad Sitelinks is a new AdWords feature that allows you to extend the value of your existing AdWords ads by providing additional links to content deep within your sites." For more see Google's blog
http://adwords.blogspot.com/2009/11/increasing-choice-and-relevancy-in.html