http://www.onyxneon.com/books/modern_perl/index.html
you can download the PDF for free:
http://www.onyxneon.com/books/modern_perl/modern_perl_letter...
http://www.onyxneon.com/books/modern_perl/modern_perl_a4.pdf
this book follows and introduces modern practices/modules developed by the Perl community in recent years.