CPAN - The Comprehensive Perl Archive Network - where the modules live
Perl Monks - You have questions, they have answers
Perl.org - a community maintained site all about Perl
Planet Perl - an aggregation of Perl blogs
TPF - The Perl Foundation, our benevolent overlords 
YAPC - Yet Another Perl Conference - Perl conferences around the world
Advent Planet - Advent Calendars (mostly Perl, but there's some JavaScript, Ruby, PHP, and Java) aggregated into one advent calendar.