There is an addon called awstats that works quite nice. It adds a panel to the server-manager, it tracks each domain on it's own. It shows you how many times a page or file has been hit, tracks the FQDN of the user and the time they were last seen. It does not corralate which user downloaded/viewed which page. Also gives you a graphical representation of your traffic over the past month and shows you which search engines have refered visitors to you as well as people that have direct links to your page. Do a search for awstats and you will find where to download it.
Terry