I'm not so sure you should blame O'Reilly.
perl.com
isn't O'Reilly's domain - it belongs to Tom Christiansen, and
he used it as his personal, perl-related, website before he let O'Reilly use
perl.com. However, Tom got to use
language.perl.com to store (parts) of the original
perl.com website, including PPT, a project started
by Tom. If you now go to
language.perl.com, it still says "by Tom Christiansen".
Abigail