Piwik is nice; another open source tool worth looking at is Open Web Analytics, http://www.openwebanalytics.com/ http://www.openwebanalytics.com/. Both have th

Piwik is nice; another open source tool worth looking at is Open Web Analytics, http://www.openwebanalytics.com/ http://www.openwebanalytics.com/. Both have their advantages and are both under active development.