Besides the regular tips, there are some other AdSense tips which a number of people miss out on unless they are very careful:
1. Use multiple ad units: Google allows you to use up to 3 ad units and one link unit per web page. Since your revenue earnings are dependent on ad clicks and ad impressions, a higher number of ad units can potentially increase your AdSense earnings. However, do not go with the maximum allowed ad units if you dont have enough content on your web page; this might offend the website visitors.
2. Use wider Ad format: Though Ad formats yield different results for different websites, the wider Ad formats (like rectangles) are generally known to be more effective than their narrower counterparts (there is a scientific explanation for this, but we can leave that out since we are more concerned with the results).
3. Limit the filters: Filters are useful for blocking the Ads that you dont want displayed on your website e.g. Ads of competitors. However, too many filters can seriously limit your revenue earning potential from AdSense Ads. So, limit the use of filters to minimum.