For a decent intro try Learn Perl in about 2 hours 30 minutes by Sam Hughes http://qntm.org/files/perl/perl.html

(although unless you;re working with an established codebase, skip the section on objects and read http://modernperlbooks.com/books/modern_perl/chapter_07.html... instead)

Unfortunately neither can I! I'm sure they had one when DuckDuckHack was first announced but the docs have changed a lot since then.