W3Perl is now able to parse CUPS logfiles. Sadly the logfile format is really poor, without any information about
filesize or filename. But it can be useful to check which users are printing the most on which printers.
CUPS stats reports will allow you to check bad users behavior (users who print too much or users who are not using a recto-verso printer), and
optimize your printer usage to save money (set your cost-saving printer as the default one).