17. Do not specify Google ads as your alternate ads. - Several services like Chitika eminimalls allow you to place alternate urls, when a targeted paying ad cannot be displayed. This involved creating an simple html page and putting the ad to be displayed instead. Even Adsense allows an alternate url feature instead of displaying public service ads. But never use Adsense ads as alternate urls.
18. Do not confuse with adjacent images - It was a common policy to increase CTR by placing same number of images as the number of text ads, which falsely gave the impression that the text ads represented an explanation to these images. Inserting a small space or a line between the images and ads is not allowed. Make sure that the ads and images are not arranged in a way that could easily mislead or confuse your visitors. More.
Whenever in doubt, it is better to ask for adsense help from the learned staff of Google Adsense. They are very helpful!
[MaHe]
