WP Super Heatmap plugin by rfrankel was created to give WordPress users a simple way of creating heatmaps for their website without any cost and without using third-party services.
All of the click-track data is stored locally and the heatmap is also calculated on your own server.
Features:
Creates a heat map of every page of your website.
All data is stored locally and no third-party service is needed.
Floating elements are fully supported, clicks are not dependent on users display resolution or browser.
You can display heatmaps by click-dates.
Plugin homepage: http://wp-super-heatmap.swampedpublishing.com/
Download and info: