Wow! Just wow. Crazy Egg will absolutely blow you away. Remember when ajax started getting popular, and some advertisers were concerned that they wouldn't be able to track pageview stats anymore? Not so! Ajax gives you the ability to track visitors right down to their mouse moves. And guess what? Someone has finally implemented this idea - woot! Crazy Egg is a website tracking system that records every click by your users. It then produces a heat map that is overlaid on your site, allowing you to understand exactly what your users are doing. What's more, it's wonderfully designed and astoundingly responsive. Here's a shot of me playing with the overlay. This one shows where users have clicked, and the popularity of those zones:
Here you can see the most popular links on Mashable:
And finally, a heatmap showing the hottest zones on the page:
These stats are fairly sparse because the tracking has only been running for an hour or so, but you can see the potential here. I'll update this post once I've had more time with it, but I do think CrazyEgg is pretty nice. Nonetheless, I suspect it may be more of a feature that an application - I see CrazyEgg being licensed and/or sold to the stat tracking companies if it becomes popular.* CrazyEgg is in prelaunch testing, so you might not be able to get in immediately - it opens to the proles in early April. :)