Really Good Packaging Explained: Top Design Professionals Critique 300 Package Designs and Explain What Makes... by Rob Wallace, Bronwen Edwards, Marianne Klimchuk and Sharon Werner
 
http://www.amazon.com/exec/obidos/ASIN/1592535453/4353-20

This book, the second in the series following Really Good Logos Explained, addresses the elements of effective packaging vs. packages that aren’t successful and what makes a particular design more powerful or attention-getting than others. Four well respected design professionals—each of whom will specialize in the area of product packaging—evaluate the 300+ design examples in the book. Each author provides specific and to-the-point observations and critiques.