It's called The Back of the Napkin: Solving Problems and Selling Ideas with Pictures.
Here's the review from Publisher's Weekly, followed by some blurbs:
The premise behind Roam's book is simple: anybody with a pen and a scrap of paper can use visual thinking to work through complex business ideas. Management consultant and lecturer Roam begins with a “watershed moment”: asked, at the last minute, to give a talk to top government officials, he sketched a diagram on a napkin. The clarity and power of that image allowed him to communicate directly with his audience. From this starting point, Roam has developed a remarkably comprehensive system of ideas. Everything in the book is broken down into steps, providing the reader with “tools and rules” to facilitate picture making. There are the four steps of visual thinking, the six ways of seeing and the “SQVID”– a clumsy acronym for a “full brain visual work out” designed to focus ideas. Roam occasionally overcomplicates; an extended case study takes up a full third of the book and contains an overload of images that belie the book's central message of simplicity. Nonetheless, for forward-thinking management types, there is enough content in these pages to drive many a brainstorming session. Illus.Even if this doesn't at all sound like your "cup of tea," I'd encourage you to check it out. The mere reading of it, at least for me, has gotten the creative juices flowing--and used rightly, I think this book could help faciliate some good breakthroughs in church, businesses, and ministries.
“As painful as it is for any writer to admit, a picture *is* sometimes worth a thousand words. That's why I learned so much from this book. With style and wit, Dan Roam has provided a smart, practical primer on the power of visual thinking.”
—Daniel H. Pink, author of A Whole New Mind
“Inspiring! It teaches you a new way of thinking in a few hours -- what more could you ask from a book?”
—Dan Heath, author of Made to Stick
“This book is a must read for managers and business leaders. Visual thinking frees your mind to solve problems in unique and effective ways.”
—Temple Grandin, author of Thinking in Pictures
“If you observe the way people read or listen to things in the early 21st century, you realize that there aren't many of us left with a linear attention span. Visual information is much more interesting than verbal information. So if you want to make a point, do it with images, pictures or graphics. . . . Dan Roam is the first visual consultant for businesses that I've worked with. His approach is faster for the customer. And the message sticks.”
—Roger Black, Media design leader, Author of Websites That Work
“Simplicity. This is Dan Roam's message in The Back Of The Napkin. We all dread business meetings with their mountains of documents and the endless bulleted power points. Roam cuts through all that to demonstrate how the use of simple drawings -- executed while the audience watches -- communicate infinitely better than those complex presentations. Is a picture truly worth a thousand words? Having told us how to communicate with pictures, Roam rounds out his message by explaining that “We don't show an insight-inspiring picture because it saves a thousand words; we show it because it elicits the thousand words that make the greatest difference.” And that is communication that works.”
—Bill Yenne, author of Guinness: The 250 Year Quest for the Perfect Pint
For more info on the book (with pictures!), see the official website.