I just found out about the Mappiness project over on Liz’s blog. In her article about Happiness she writes:

Mappiness, part of a research project at the London School of Economics, maps happiness across space. The researchers intend to better understand how people’s feelings are affected by features of their environment — from pollution to noise to green spaces — while they’re doing ordinary things. They hope to publish the research; meanwhile, users who download it can enter data that is charted for them hour by hour over time so that they can visually monitor their own happiness.