I discovered this last week, found it valuable, and thought I would pass it along....
The wonderful folks at Google have provided a great, free service that allows you to get detailed stats about your web site. While many of us already have a method of tracking visitors to our sites, adding this service to your pages can fill in any missing information your stats programs doesn't provide.
Also, those who use free web services from their ISP do not have any method of tracking visitors other than some sort of hit counter. This service can give you the details you might be looking for.
The service is called
Google Analytics (
http://google.com/analytics) and it is a FREE service. All you need to do is create an account and add one line of JavaScript code to the bottom of pages you wish to track. It takes about 2 minutes to set this up on your site if you use a common footer file for all your site pages. Once set up on your site, Google begins displaying results for your pages in about 24 hours.
I've set this up on my own site recently and found that it works really well. It's easy to make sense of the charts and numbers Google generates. I use it in combination with the stats programs my host provides to get additional information the server stats don't provide me with.
One feature I found interesting about Google Analytics is that it breaks down my visitors by state and even city - something my current stats program doesn't have the ability to do.