Knowing were the first or most looked at spots on your site can help in many ways. From where to put important info or where the placement of ads will be. There are many rules of color on what background, where to place images and flow of color, with these you’ll know almost were the reader will always be looking, when not reading the post.
The rules are many and can take years to learn, even with a chart, most webmasters wouldn’t know if they are focusing on the correct areas. But there is a cheat sheet, it’s called Feng-Gui. At Feng-Gu you put in your web address and a HeatMap is created. This heatmap shows you the areas of your site that draw the human eye toward them.
From the site:
* The ViewFinder algorithm creates a Saliency attention heatmap.
The salience map creation is based upon neuro-science studies of visual Attention, Perception and Cognition of humans.
Or in English: What people are looking at?
* The ViewFinder Heatmap service captures a snapshot image of the requested website and generates a visual attention heatmap.
* Heatmap – from dark blue through green to red, describing the temperature heat of the image heated by human eyes.