A great update to the first edition, which was a classic. This belongs in the reference library of every web and user experience designer. Although Dan Brown clearly wrote this with web designers from the IA/UX persuasion in mind, there's guidance throughout that can be leveraged by those from other design and creative disciplines that need to communicate their work to various audiences.
For me, that's the secret sauce that makes this book so valuable. Besides the excellent information (and more illustrations) on structure and tools for creating effective communications, it provides guidance on when and how to frame and use different types of communications (deliverables or diagrams) to facilitate discussions, work with stakeholders, clients, and other contributors, and enable projects to move forward. If you work with clients or stakeholders (what designer doesn't?), this book will help you be more successful.