The Google AdSense team has made some new additions to the program over the past few days. The first is a new text link referral program to go along with their image referral ad program. This is a surprising addition because many thought AdSense would never allow text link referrals, but it is worth noting that publishers cannot customize the text in the links, and it is generated by an AdSense script, not a simple html link as with most referral programs.
They also launched a new site-flavored AdSense for Search option that allows AdSense to learn and then "flavor" results to tailor to the specific site. This would help AdSense know whether someone is likely to be searching for mouse the animal or mouse the computer mouse, for example, and then tailor the search results for that.
Lastly, they have included image ads in two new ad unit sizes, including the Large Rectangle, the most popular ad unit with publishers, as well as the Square.