CrazyEgg is a tool that lets you see in different graphical formats where people are clicking on your website, or what are known as hotspots. This isn't to say the most popular pages, but where people are clicking once they arrive at a particular page.
This is very revealing information. It'll tell you, for instance the most commonly accessed areas of your site, so you can put premium information there. It also tells you if there's a disparity between where you're thinking people are clicking and where they actually are.
And I love that it tells you graphically, for instance in heatmaps:
Or with confetti:
What I like most about CrazyEgg is that it's free. At least a stripped-down version is. If you want heavy coverage for a big site, you can sign up for a monthly plan.