Yes- Its new development for me when i received email for Google Adsense team that i should not use link units in line with other links. example page. http://www.nichewatch.com/seo.html where now i have changed link units from 200 X 90 to 728 X 15. There was break between link units and other links and no heading for link units. I am curios .. have you experienced same in these days?