The visitor logger class was desiged to be as easy to use as possible. It can be included into your website with 3 lines of code, and one of the lines is just an php include. Using functions within the class you can retrive simple information (ie. the number of unique hits to your site) or you get more detailed and informative data. The visitor logger stores information on the BROWSER_NAME, IP_ADDRESS, LAST_VISITED_TIME, NUMBER_OF_REFRESHES and can also be easily updated.
It's well worth a look if you looking for something which runs fast without a database.