http://www.statcounter.com/
This is a free stats counter. You can alter it to your likes/needs. I use it on all my top sites to track people, where they are coming from, what link they left on, how long they have been in each section of my site, and the country they are in. Shows much more than what I listed here. But a very useful tool if you want to know in-depth details about your visitors.
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