The World According to Malcolm Gladwell
The Tipping Point (2000) examined how few people it takes to spread a small idea, message or behavior throughout our society.
Blink (2005) examined how people make 'blink of an eye' decisions using first impressions and instinct; who's successful at "blinking" and why.
Coming this November (2008) is Gladwell's Outliers, an examination of what makes people successful. Place your reserves and get ready to tip and blink again...