The Inside AdSense blog talks about the newest feature available to Google AdSense users: AdSense for Search is now powered by custom search. This new feature gives you the following benefits: site search, improved indexing of pages, vertical search, the ability to fine tune search results and ads with keywords, selecting ad location, and more.
Check out the video for more information:
As someone who had an extremely difficult time trying to get Google Coop with AdSense installed on my site in the past, this was a breeze. Literally. I'm so glad that the Google AdSense team fixed it up. Thank you. :) (On that note, I *strongly* recommend that you set up your Google Custom Search Engine through the Google AdSense control panel, not through google.com/cse -- that's where my problems started!)