As a useful addition to the webstats armory Visitors offers a quick way of getting a HTML report of site usage from server logs. We mainly use AWstats, Webalizer and Analytics products (Google Analytics, Piwik) but I found Visitors useful today. Install from Synaptic or with:
sudo apt-get install visitors
Then run it against your logs like so:
visitors -A -m 30 *.access_log -o html –trails –prefix http://www.mywebsite.com > report.html
More information on the Visitors website.