Which parts are being frequented the most. Failure Report Requested files which failed to be delivered. Perhaps a bad link or something not showing up properly on your pages or the request was cancelled by the visitor. The last place a visitor was before coming to your site. Perhaps a link to you on their page.
Reciprocal links bring in lots of traffic.
The more the merrier. Perhaps a bad link to you on their page or something not showing up properly on your pages. May also indicate requests which were redirected from a sub-domain. For example if your site is hosted at more than one location. Which version of WWW browser software and which type of computer system visitors are presently using to visit your site.