I found many sites about happiness on the Internet :
http://www.springerlink.com/content/1573-7780/
a social psychology journal with studies largely based on subjects' self-reports. Very serious!
http://www.wisdomquotes.com/cat_happiness.html
Happiness Quotations. It is a fun site.
http://www.answers.com/topic/happiness
Psychological view, Societal theories of happiness and Mechanistic view.