AWStats is short for Advanced Web Statistics. It's a free tool that
generates advanced web (but also ftp or mail) server statistics, 
graphically.

This log analyzer works as a CGI or from command line and shows you 
all possible information that your logs contain, in a few graphical 
web pages. It uses a partial information file to be able to process
large log files, often and quickly.

It can analyze log files from IIS (W3C log format), Apache log files 
(NCSA combined/XLF/ELF log format or common/CLF log format), WebStar 
and most of all web, proxy, WAP, and streaming servers (and FTP 
servers or mail logs).

WWW: http://awstats.sourceforge.net