The Grip Book, 4th Edition - This is the bible for anyone interested in either becoming a "grip" or needing additional and updated information on the profession. The grip does everything - set up, break down, installation and maintaining all gear - cameras, lights and specialty equipment.
Not only does it contain information on updated equipment but it will give you guidance as to how to enter the business. This is not just a reference book with lists of equipment. It's a learning tool that will serve as an invaluable source of information.