Google released the integration between AdSense and Google Analytics to all publishers that will provide more detailed information about traffic to your pages and how users interact with your site. Just sign in to AdSense and click the 'Integrate your AdSense account with Google Analytics' link on your Reports Overview page. A step-by-step wizard will guide you through the process. To link an un-supported language with Analytics, follow this link. Once you link your accounts, you'll find an AdSense-specific menu under the 'Content' section of the left-hand navigation bar on your Analytics homepage, containing these reports: Top AdSense Content, Top AdSense Referrers, and AdSense Trending

More info: Google Analytics blog