Everybody needs to know how popular is his website, how many people visited it, and what keyword has bigger density. With a simple search on big search engines like google, yahoo, msn, aol you will find a lot of free tools which will show you all these things. Some of them can display a history of your sites with number of pages indexed, number of visitors per day, a keyword verification. The last one is helpful because you can check for a given keyword the page where your site is on big search engines. You can say your site is on top if it is on first three pages, because most users check outside for first three pages.
A great tool is that one which show your link popularity, meaning the score that a search engine has for the site. Your link popularity is stored, and you can view a history of the site or compare it with other competitors sites.

Hi SeoGuy,

But Have you mentioned that site which have all this facilities ?
I am using Google Analytic for getting the information which were you written in your last post.

What is you experience about Google Analytic ?