Badass: Making Users Awesome

I learned of Badass: Making Users Awesome by Kathy Sierra after Bob Payne referred me to the Modern Agile movement. Kathy's book seeks to answer one question: Given competing equally priced, equally promoted products or services, why are some far more successful than others?

This 400 word summary will give you a sense of the book. If you create products for a living this then I highly recommend this book!