The Speedlight Studio by Michael Mowbray

Michael knows his stuff when it comes to using speed lights for his work. He has definitely mastered his technique. He goes over what products are available and what he prefers to use. He has plenty of examples of how to use speedlights to create professional portraits. He discusses common lighting patterns and how to accomplish them using speedlights and their modifiers.
Find it here:
Amherst Media
Amazon
Barnes & Noble