I have no association with this company, but their heat-maps tracking tool looks great.
“clickdensity records the position of every click on a page, building up a virtual heat map of visitor activity. But that’s just the start. It also provides user behaviour analysis, segmentation and tracking. Together with a host of other functionality, clickdensity will transform your approach to usability and information architecture.”
On first glance, ClickDensity appears similar to ClickTracks in that the visitor information is integrated with the page, making it easier to see what is happening where. These are great tools, particularly for usability and layout analysis, and there’s a free demo.