Just came across this interesting read as to some of the reasons why some of us lost SERPs at the last Google update........ http://www.promotionworld.com/se/articles/article/080519KnowAbouttheGoogleDeweyAlgorithmUpdate.html Theres rumours that: "...Google is trying to recalibrate AdSense. Secondly, it is suggested that Google is implementing some of its new search technology that is part of a longer term strategy...."