Web site analytics, for those who might not be familiar with the term, is the tracking of various performance metrics for a given web site. The metrics themselves can range from the simple (and relatively useless) count of " hits", i.e. requests for a given resource such as a single web page, image file, etc., to the measure of far more complex interactions. These complicated interactions can be totally arbitrary; for example, you might want to know the number of orders from visitors who were referred by search engines and scrolled at least halfway down a long sales page.

That assumes, of course, that you can figure out how to configure all that tracking, interpret the results and afford the monthly fees for the providers of the service. The cost issue is apparently solved: Google Analytics (http://google.com/analytics) is currently free in its beta version, and early indications are that it will remain so. However, a word of caution is in order: The Terms of Service referenced on the Google Analytics home page seems to indicate that Google can and will make use of your site