http://www.weblogexpert.com/lite.htm

WebLog Expert Lite is a free log analyzer which allows you to quickly and easily analyze your log files and get information about your site's visitors. It supports IIS and apache server log files with automatic detection capability for log formats.

Feature wise, it shows statistics for your web pages, images, files and directories. It displays visitors from top level domains, referring sites, search engines, search phrases. Few other details available with this lite free tool are error types, browsers and operating system information.