Audiobooks are usually distributed on CDs, cassette tapes, or digital formats (e.g., MP3 and Windows Media Audio). The term "books on tape" is frequently used as a synonym for audiobooks, but cassette tapes are no longer the dominant media for audiobooks. In 2005, Cassette-tape sales made up roughly 16% of the audiobook market, with CDs sales accounting for 74% of the market, and downloadable audio books accounting for approximately 9%. In the United States, the most recent sales survey (performed by the Audio Publishers' Association in the summer of 2006 for the year 2005) estimated the industry to be worth 871 million US dollars. Current industry estimates hover at around two billion US dollars per year. Most new popular titles put out by the major publishers are available in audio book format simultaneously with publication of the hardcover edition. There are approximately 25,000 current titles on cassette, CD, or downloadable format. Unabridged audiobooks are word for word readings of a book, while abridged audio books have text edited out by the abridger. Audiobooks also come as fully dramatized versions of the printed book, sometimes calling upon a complete cast, music, and sound effects. Each spring, the Audie Awards are given to the top nominees for performance and production in several genre categories. There are quite a few radio programs serializing books, sometimes read by the author or sometimes by an actor, most of them on the BBC.

Jon Kabat-Zinn (born June 5, 1944) is Professor of Medicine Emeritus and founding director of the Stress Reduction Clinic and the Center for Mindfulness in Medicine, Health Care, and Society at the University of Massachusetts Medical School. He teaches mindfulness meditation as a technique to help people cope with stress, anxiety, pain and illness. His life work has been largely dedicated to bringing mindfulness into the mainstream of medicine and society. Kabat-Zinn is the author or co-author of scientific papers on mindfulness and its clinical applications. He has written two bestselling books: Full Catastrophe Living: Using the Wisdom of Your Body and Mind to Face Stress, Pain and Illness (Delta, 1991), and Wherever You Go, There You Are: Mindfulness Meditation in Everyday Life (Hyperion, 1994). He co-authored with Myla Kabat-Zinn Everyday Blessings: The Inner Work of Mindful Parenting, (Hyperion, 1997). Other books include Coming to Our Senses (Hyperion, 2005) and his most recent book The Mindful Way Through Depression: Freeing Yourself from Chronic Unhappiness, co-authored with J. Mark G. Williams, John D. Teasdale and Zindel V. Segal (Guilford, 2007). Kabat-Zinn is the founder and former Executive Director of the Center for Mindfulness in Medicine, Health Care, and Society at the University of Massachusetts Medical School. He is also the founder (1979) and former director of its renowned Stress Reduction Clinic and Professor of Medicine emeritus at the University of Massachusetts Medical School. Kabat-Zinn received his Ph.D. in molecular biology in 1971 from MIT where he studied under Salvador Luria, Nobel Laureate in Medicine. Kabat-Zinn has made significant contributions to modern health care with his research which focused on mind/body interactions for healing, and on various clinical applications of mindfulness meditation training for people with chronic pain and/or stress-related disorders. Kabat-Zinn began teaching the Mindfulness-Based Stress Reduction (MBSR) at the Stress Reduction Clinic in 1979. MBSR is an eight week course which combines meditation and Hatha yoga to help patients cope with stress, pain, and illness by using moment-to-moment awareness. Such mindfulness helps participants use their inner resources to achieve good health and well being. Kabat-Zinn and colleagues have studied the effects of practicing moment-to-moment awareness on the brain, and how it processes emotions, particularly under stress, and on the immune system. He is a board member of the Mind and Life Institute, a group that organizes dialogues between the Dalai Lama and Western scientists to promote deeper understanding of different ways of knowing and probing the nature of mind, emotions, and reality.