If you have a business web site it can be important for you to know how many visitors are going to your web site, particularly if a good Google search engine ranking is important to you.
There are lots of packages that will track the visitors to your web site. They all seem to inturpret the data in a slightly different way and reports from the same web site on different packages may well look very different.
Google Analytics is a powerful tool for monitoring all aspects of your web site's traffic from referring web sites to search engine activity. It is one of the best tools out there for analysing traffic on your web site, it can give you an enormous amount of information about who is coming to your site, what they're looking for, and how they're getting there.
AWStats is a free powerful and featureful tool that generates advanced web, streaming, ftp or mail server statistics, graphically. This log analyzer works as a CGI or from command line and shows you all possible information your log contains, in few graphical web pages.