Robert Biswas-Diener is a big name in positive psychology research. He’s sort of the Indiana Jones of positive psychology; he travelled around the world, through rich countries and tribal cultures, investigating happiness in these varied places. Rumour has it he took a whip and a hat along with him, although I can’t confirm this.
Anyway, he’s got several great articles up on his website, Intentional Happiness, and an audio describing some of the discoveries he made about happiness while on his travels. At the time of writing, he has a few articles on happiness and some on strengths, so if you like the stuff on this site, you’ll probably like those too.
A special note has to go to his article on incubators, which will probably change the way you look at procrastination. Definitely check that one out – you might not be a procrastinator after all!
Finally, if you’re a psychology student looking for journal articles on happiness, there are loads of references on the site, many of which have links to free pdfs – very useful.
Worth a look!