Just cleared out all my logs and went on the search for an analyser and came across this free (lite) tool.
WebLog Expert Lite is a Web server log analyzer. It can return specific, precise information and statistics about visitors to your site, including general activity, file access, referring pages, search engines, browsers, operating systems, errors, and more. The program generates HTML-based reports with tables and charts. WebLog Expert Lite supports log files of Apache and IIS servers and can read GZ and ZIP compressed logs.