Hi All I have a number of different sites with different target audiences. Following advice from A direct marketing professional I conducted A/B split testing with ad colours and discovered that different add colours work better on some sites and worse on others. (well, 'Duh!') Therefore I can say with absolute certainty that advice such as 'black on white is best' should not be followed blindly. If you want to get the maximum clicks available, I suggest you do as many split tests as you have time for. Balck on white may be best on one page, but the reverse may be true on another. A/B Split Testing is the technique used by professional direct marketing agencies to make the most money. Adsense is a form of Direct Marketing and therefore it makes sense to use the ticks of 'our' trade. Does anybody disagree?