I've had the opportunity to play with a teeny tiny bit of perl while helping on the Plugin Manager project (which you are welcome to leave some of your thoughts and comments on!), and so since I have a ton of windows open with great info right now, I figured I'd post them here
- PerlFAQ – excellent assortment of questions and answers, in a easy to understand way.
- CPAN — source for perl modules and info on how to use them (your host may have some of this info available on your control panel so you know which modules are installed).
- Online Perl Library — read perl manuals online for free.
- Perl Documentation