The AdSense forum has lots of good information but there is a lot of awesome information outside of the AdSense forum that will be useful for AdSense publishers seeking to improve their AdSense income. Many of the issues affecting AdSensers, involve answers found on the other forum categories within WebmasterWorld. I'm going to post links to discussions that may be useful to the AdSene publisher who feels they aren't earning enough and want to improve.
In order for AdSense to work, your site visitors, at least a percentage of them, must be interested in buying things. Learning the basics of earning on the web OUTSIDE of AdSense is important in order to earn significantly INSIDE AdSense. There is NO get rich quick recipe. You can't buy this for twenty dollar or find it on a WAHM site. Study.
Finding profitable niches [webmasterworld.com]
Fuzzy is good [webmasterworld.com]
Optimizing for obscure phrases [webmasterworld.com]
Look into my eyes
Improving content site revenue
Ugly sites sell
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[edited by: engine at 10:30 am (utc) on June 15, 2009]
[edit reason] Added note [/edit]