I'm in the process of reading this book and read almost first half of the book, this is the book I have been searching for 2 years.
I recommend this book after reading the books like, learning perl, intermediate perl.
This is book is following a wonderful tutorial-istic approach, a must read and a must have book in your(our) perl library.
UPDATE:
I have learned to use the typeglobs effectively after reading this book.
I am talking about the book authored by Sriram Srinivasan.