Yes!: 50 Scientifically Proven Ways to Be Persuasive by Noah J. Goldstein, Steve J. Martin & Robert B. Cialdini
I thought this review on Amazon.com summarized everything nicely:
3) Social Proof
6) Commitment and Consistency
This book consists of 50 short chapters where these weapons are at work. Very entertaining and insightful, but I felt that the authors violated some of their own advice by having so many chapters and not organizing them in any particular way. For example, the chapters each demonstrated one of the weapons of influence at work and perhaps the book should have been organized more formally into 6 parts with each part representing one of the weapons. I was very entertained but I am not sure if the book will have any long lasting educational value unlike "Influence".
This is a quick read and I highly recommend it AFTER you have read Cialdini's "Influence".