The New York Times has done a simple list of pointers to basic articles and research on well being. I'm passing on a few of the items from a condensed version of that list, rearranging the list in almost reverse order to reflect not importance, but items that seem to me to be less commonly acted on. So, keys of happiness:
Don't obsess about it, and don't overdo it.
If all else fails, fake it.
Make friends, family, and weekends a priority