NYTimes: Mining the Web for Feelings, Not Facts

Sentiment mining: now this is a business I could invest in. Playing
on the growth of interactive 'web 2.0', mining of all the public
feedback available out there will become an importan corporate tool. I
cannot imagine what the fellas at Google hav already developed.

From The New York Times:

Mining the Web for Feelings, Not Facts

The universe of reviews, ratings and recommendations online open a
tantalizing window on the collective consciousness.

http://www.nytimes.com/2009/08/24/technology/internet/24emotion.html