Perl.Com
The official Perl home page, run by O'Reilly. Contains documentation, news, and links to a variety of resources. http://www.perl.com/
The Perl Institute
Non-profit organization dedicated to making the incredibly useful Perl language even more useful for everyone. Supports Perl creators, developers, maintainers, and users. Recently disbanded, and is being incorporated into the Perl Mongers. http://www.perl.org/
CPAN
The Comprehensive Perl Archive Network, the gateway to all things Perl. The canonical location for Perl code and modules. http://www.cpan.org/