This tool takes your server logs (or a part of them) and checks all referrer URLs from the search engines Google, Yahoo!, MSN/Live and Ask.com. It tries to take appart the referrer information to provide interesting (and fun) numbers.
This online tool is limited to log files with less than 3MB. To check larger log files, take a look at the Windows-based version of this tool at oyoy.eu.
It generates statistics in HTML, Text, Tab-separated-values (for your spreadsheet) and XML formats. Additionally, it generates statistics in HTML which can be shared without giving out any information about the site (no absolute numbers, no links to the log files processed). The sample report shows you what you can expect.
This tool uses your log files - by transfering those files it is possible that a third party might intercept them (though the chance that it would happen is probably very, very small). This server does not store your log files once they are processed. Only the final reports are stored here.