The creativity of humans unleashed on the internet never ceases to amaze me.
(Also the crassness, vulgarity, crudeness, stupidity, boringness [is that a word?], hatefulness and all those other deplorable traits, but today we're talking about creativity.)
We Feel Fine mines the feelings of bloggers from their posts, categorizes them by several metrics, and then presents them in intruiging ways. It sounds boring, but it isn't. You can read a better description on their Mission page, but the best thing is just to load the application and click around a little.
So, go get in touch with the feelings of the world today.
Nod to: Blake Atwood
Warning: Moderately addictive