The Brand Gap by Marty Neumeier is one of my favourite business books for three reasons:

• it explains clearly what a brand is (trust),
• it provides a high level view of how to build a brand, and
• you can read it and understand all of the concepts in 90 minutes.

This slide presentation tells you all you need to know about the book - the book uses the same illustrations but with additional text that's worth the investment.