Traffic Analysis Tool: Google Analytics

I decided to start using again Google Analytics to analyse my Blog´s traffic.
Google Analytics is a free tool that provides a complete traffic report. All you have to do to install this tool is add a piece of HTML code to your Site/Blog. Then, you have to wait a couple days before it´s active.
To get a detailed report, all you have to do is visit: http://www.google.com/analytics/
Log-in, and voilá, all statistics shown in an accurate re-designed format. Some statistics are provided in colored pie graphics that simplify data reading.
I also found that Google has a few more free services for webmasters, check out their page, all services are free.
If you´d like another option to measure your traffic you can use Sitemeter, it´s also a free tool.