If you're new to Perl, or if you would like to brush up on your skills, leaf through the following O'Reilly books, both well-respected additions to any Perl programmer's library:
The Perl Cookbook (http://www.oreilly.com/catalog/perlckbk2/) by Tom Christiansen and Nathan Torkington
Programming Perl (http://www.oreilly.com/catalog/pperl3/) by Larry Wall, Tom Christiansen, and Jon Orwant