Today I setup Media Grease to use the free Google Analytics service. Google’s system gives webmasters detailed statistics about how their website is used. You’ll know how people got to your site, how long they stayed, what pages they visited, where they live (roughly), and so on.
Stat tracking of this sort has been around for a long time, but the power and cost of Google Analytics is hard to beat. It’s also easy to install. Just include a few lines of Javascript near the bottom of your site template.