Ther Happiest Developed Nation in the World is........

.....Australia.

http://www.smartplanet.com/blog/bulletin/why-australia-is-the-happiest-developed-nation/20654?tag=nl.e660&s_cid=e660&ttag=e660

A high rate of employment and a long life-span for its citizens, among other things. Australia is followed by Sweden, Canada, Norway, Switzerland, and the United States.

I'm not surprised. Australia is awesome!