I just picked up "How to Retire Wild, Happy and Free" by Ernie Zelinski as an audiobook from my public library. It is not a "how-to" book on saving for retirement, but rather debunks the myths (also debunked here) that we all need a massive nest egg to retire on. The focus of the book is on making the psychological adjustment to retirement -- dealing with the attendant lifestyle and identity changes that foster fear and keep many of us working too long. It's full of lots of practical advice on how to structure your retirement to avoid boredom, explain "what do you do?" to people and how to stay active and healthy.
Highly, highly recommended!