Great thread Fred, I've been meaning to do this for a long time. In fact I started writing my own personal reviews, which really amount to the key points I've taken from each book.
Here are a few of my favorites:
Damage Control – by Dave Pelz
Golf's Sacred Journey: Seven Days at the Links of Utopia – by David Cook
Golf is Not a Game of Perfect – by Dr. Bob Rotella
Secrets of Golf Instruction & Flexibility – by Roger Fredericks
The Art of Scoring: The Ultimate On-Course Guide to Short Game Strategy and Technique – by Stan Utley
Unconscious Putting – by Dave Stockton Jr.
I'd have to say that the one that has had the greatest effect is the Fredericks book. At 48 years old last winter, I decided to try to regain some of the flexibility I'd lost over the years. I adopted the "short" program in the book and I had my best season in 35 years of playing the game. Got my index to an all-time low of 1.1. It had almost never been lower than 3.
Fredericks also sells a DVD set that matches the book.