This is one of my favorite Perl tutorials. I don't know a ton about Perl, but I've worked with it a little bit.
Some people hate on Perl, but it is still one of the most powerful languages out there. No, you aren't going to see as many job offers on Monster.com for Perl... but if you need to program for yourself, its still a popular choice among some of the best. I recently thought of Perl when I was listening to one of the most well regarded SAAS company CEOs talking about how his software was primarily written in Perl.