The content of that article is part of the same author's book "Influence: The Psychology of Persuasion" (http://www.ssireview.org/articles/entry/the_power_of_persuas...) which is one of the most interesting books I have ever read.

Even though it is not "new" I posted it because I wanted to ask the question of what are some of the sites out there that you have found employing those techniques to sell their product online.

I was going to post the exact same comment just now. I loved `Influence', read it in almost one sitting. Makes you look at marketing and interaction under a different light.