Incredible and inspring book on how to locate and fix usability problems yourself. Most of the advice centers around web design, but the process described can easily be modified to any other product. The book is delightfully short (under 200 pages), very well written and packed with useful information.
My own startup is following the process outlined in this book and the results are just amazing. Usability skeptics will be immediately converted once they see a test in action. I will be looking forward to the day where this stuff ends up in science curriculums, then we will truly enter a age packed with useful simple things and the clumsy 50 button VCR remote control will be a relic of the past. Highly recommended.