Google Analytics is a free service offered by Google that generates detailed statistics about the visitors to a website. Google recently acquired Urchin Web Tracking system and made it available via Google Analytics.
If you have content behind a security firewall or on an intranet or internal network that prevents you from using the Google Analytics service, you can use the original Urchin Software (Note that this is a paid service )
Till few days back, Google Analytics was available only by invitation. In contrast to “invitation” based marketing, this invitation could not be sent by users using Analytics, it was sent out only by Google. When my AdSense account was approved, I immediately got the Analytics Invitation as well.
2 days back Google announced that they are opening Google Analytics to everyone. Now you don’t need to wait for an invitation.
Go sign up with your Google account grab the analytics script..