I have read none of them, but according to Amazon.com Oultiers is the highest seller, if you judge greatness by sales.

http://www.flickr.com/photos/33749589@N07/3235168387/

But when you sort them by rating "Tipping Point" is the highest rated.
Source(s):
http://www.amazon.com/s/qid=1233204046/ref=sr_st?rs=1000&page=1&rh=...

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Since this is a fairly subjective question, going to the site provided will help you by giving you excerpts and overviews of his literary collection. I mean, you could judge by best selling, but your own personal opinion derived by some form of data would be more beneficial to you, don't you think? :)

Happy hunting!
Source(s):
http://www.gladwell.com/blink/index.html

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