Blink basically talks about an everyday occurrence common to all of us. We all do it without thinking; exercising instinct. 
 What he does is simple, he first shows us how often we 'thin slice' or make split second decisions based on limited information, then shows us how accurate these decisions can be. 
 He then also shows us the downside of completely trusting your instincts because without expertise and knowledge, we are not capable of making GOOD split decisions. 
 The last part of the book talks about what can be done to control the way we make spit decisions and gives some general awareness of how quick judgments can be improved. 
 Gladwell backs up all his statements with experiments and detailed studies that have been carried out over the years by experts in the field. The most outstanding for me was the section on 'mind reading' and the detailing of the work of Paul Ekman. http://www.google.lk/search?sourceid=...