Yes. The absolute best system out there. You can see where the visitors come from, what keywords they used to find your site, how long they stayed on your site, where they are from, what browser they were using, etc, etc, etc and you dont even display a silly hit counter on the page
It uses javascript so users dont even realize that the counter is there. google.com/analytics You can track all your sites from one account by creating different channels too. Soooo good.. You just have to try it to see what I mean.
