Google offers free analytical tools

The search giant plans on offering a set of analytical tools designed for web developers, administrators and advertisers, which should help them define what information their visitors are most interested in and thus improve the content of their sites.
Google thinks that based on the information given by these tools, website developers can optimize their sites according to the visitors' needs and interests. Google Analytics can be used to figure out what keywords attract visitors, which promotions really interest customers
and how to design Web pages that draw attention.