So in short the major changes (as per my understanding of the above differences) are: 1- You can put adsense search and referral ads on pages without content 2- You can put adsense on error, registration, chat and thank you pages 3- You need privacy policy on your site with says that advertisers (google) may use cookies to track information 4- You can show adsense ads from more than one adsense account on same page at the same time 5- You can now run contextual ads from other companies like yahoo on the same page Source and full article : Jim Karter Blog