Minimalist Lighting: Professional Techniques for Location Photography

My 2 humble cents. Check out this book by Kirk Tuck. Is an understandable, useful, simple and yet terrific book about the use of small location lights. He not only explains all the technical requirements, tricks and useful tips to get the best out from even the cheapest goods, but he also gives practical examples with images and drawings that explain how to practically build a successful lighting set up for many different situation

I think this is the right book for those who, like myself, love to use the small portable flash and want to get the best out of its potential

This is Tuck's website if you care to read more about him and his work http://www.kirktuck.com/Blog/Blog.html

There's also a #2 coming dedicated to studio lighting techinque, will be out in April, check this http://www.kirktuck.com/Book_2.html