How to link Google Analytics account to Google AdSense account in the new interface:
Google Analytics changes its interface more than some developers change their socks... here's the where to find the link with the new interface (circa 2012).
1. Click on the 'admin' tab in the top right corner of the new analytics interface:
2. Here's the tricky bit. You need to Click on the 'All Accounts' link at the top right of the page.
3. After clicking on one of your google analytics accounts... only then, will you be able to find the elusive 'data sources' link in the new google analytics interface.
4. Then you'll be able to click on the 'AdSense' tab and be able to find the right button to finally figure out how to 'link accounts' in the new google analytics interface.
That is, until Google Analytics decide to change their interface again :/