It is particularly well suited to web server logs, but can process almost any log. The reports that Sawmill generates are hierarchical, attractive, and heavily crosslinked for easy navigation.
Complete documentation is built directly into the program.
Using an interview format, it asks questions when it needs information, so you only have to deal with the configuration options which are relevant to the task at hand. Statistics pages are full of links to related information, organized intuitively so you can get to the information you want with a minimal number of clicks. A powerful hierarchical optimization feature automatically reorganizes the hierarchy to increase the amount of useful information on each page. The manual for Sawmill is built right into the CGI program, so it's always at your fingertips as you use the program. Throughout the HTML interface, there are links to relevant sections of the online documentation, and wherever a configuration option is mentioned, or a value is requested for it, there is a link to that option's documentation page.