In addition to the books and links posted above, there is also the Getting Started With Perl Tutorials here at The Monastery.

As a good beginning book, I like Learning Perl by Randal L. Schwartz & Tom Christiansen.

One collection that I recommend is The Perl CD Bookshelf. I keep a copy on my laptop for both reading and reference. As the blurb on the O'Reilly site states: Included are the second edition of Perl in a Nutshell (paperback version included), the third editions of Learning Perl and Programming Perl, the Perl Cookbook, and 3 new titles: Perl & XML, Perl & LWP, and Mastering Perl/Tk. Formatted in HTML, The Perl CD Bookshelf, Version 3.0, can be accessed with any web browser and includes a master index for the entire library.