Yesterday, Google AdSense informed that they have integrated Custom Search Engine (CSE) into AdSense for search, so you can take advantage of CSE’s most popular features without having to leave your AdSense account.
This new feature gives you the following benefits: site search, improved indexing of pages, vertical search, Tuning search results and ads with keywords, selecting ad location, and more.
Just visit your AdSense Setup tab and select ‘AdSense for Search’ as your product to get started with above features. Once you’ve set up your search box, you may wish to explore more advanced features such as site exclusion, labels, and collaboration. Please note that these new features will only be available to you if you’ve migrated your account to a Google Account.