I have read this article :
And I take the opportunity to tell you what i think of this Tools –> EASY you have to use it.
Again this Analytic tool from Google is one of the best tool for webstatitics and it’s free (depending of the volume of course, but if you use Google Adwords then it’s stays free).
You can do whatever you want with it and it’s really user friendly (again you need a Google Account)
Some extract: « Google Analytics has only been available for about two years, but is already used by one third of the top 500 websites in the world.
We here at Pingdom use Google Analytics ourselves and were curious to see how many of the top web properties out there use it. We put the Alexa global top 500 websites under the microscope and found that 161 out of these 500 websites are using Google Analytics, which is 32.2%. »