And 1 very important thing... A series of relevant ads showing up!! if they are not relevant, the chances of a click on that ads is very small.
very optimistic. anyway i think the source is - http://www.associateprograms.com/articles/129/3/How-to-boost-your-AdSense-revenue
In the end, its better to stick to making good online content so that even big sites will link back to you..plus those splogs too....lol