Perl 5 and Perl 6 are two different languages.
Perl 5 and Perl 6 are both part of the Perl family.
Perl 5 has a website at http://www.perl.org/ because it was once the only one.
Perl 6 has a website at http://www.perl6.org/ because it started out with Perl 5 already existing.
And I use, and love, and intend to continue using Perl 5.
(this was originally written to go with the complete rant available here (no, really, rant. You Were Warned))