Google Analytic, The Best and Complete Tool to Watch Websites

http://www.google.com/analytics/

it's the best tool to watch your websites.

Just sign up for free, you'll be able to see

-your trafic stats
-where are they coming from (direct, referral, or search engine)
-which referral are they coming from
-what keywords did they search for
-what country
-language
-operating system
-etc

The only thing that bothers me is, it's not live. you should wait for the next day to see today's report.

just sign up @ http://www.google.com/analytics/

(what the hell with my "advertising language".. -_- )