My friend Tomek, a visual interface designer par excellence (http://www.pixelbox.com/), introduced me to this site a few weeks ago… it floored me with its insight and its visual display. It is similar in principal to our lexical text mapping tool here at Exvisu. What WeFeelFine lacks in flexibility and depth (we check word correlations for all words in blog postings) it makes up for in real time response and sheer beauty of the interface:

Check it out first http://www.wefeelfine.org/.

And then read how it works (from the we feel fine site):

The We Feel Fine data collection engine automatically scours the Internet every ten minutes, harvesting human feelings from a large number of blogs.
We Feel Fine scans blog posts for occurrences of the phrases “I feel” and “I am feeling”.
Once a sentence containing “I feel” or “I am feeling” is found, the system looks backward to the beginning of the sentence, and forward to the end of the sentence, and then saves the full sentence in a database.
Once saved, the sentence is scanned to see if it includes one of about 5,000 pre-identified “feelings”.