Webdesigners have been using heatmaps for ages to optimize their sites navigation and to make their sites more user friendly. Heatmaps show you where the visitor is focusing his attention and if tracked over time will show you how the users scans over your pages. I did some research on this found some good ways to use this info for better ad placement. The article describes where the user focusses most and where an ad should be placed in terms of a users eye path over you pages, both in relation to timing and placement. have looksie, hope you find this valuable info: Best Ad Positions using Heatmaps
Heat maps are a great way to increase your adsense earnings, if used properly you can easily increase your earnings.
Google provides a very simple and easy to understand heatmap. https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=17954
@internetmarketingiq, yeah i know about that heatmap, I wanted to get some more detail though and use an alternative approach.