Rick Hanson has a very good article on the causes of dissatisfaction and suffering that you can find here: The Second Noble Truth – The Noble Truth of the Cause of Suffering
The following is an interesting article that, like Kramer, extends the second noble truth to include suffering caused by relational and social interactions, but it approaches the second noble truth from a secular perspective. Like David Loy (author of Ecodharma), the author suggests that working for social change is a necessary part of relieving stress and suffering and that the standard approaches of Buddhist practice emphasizing personal changes in our response to stress and dissatisfaction are necessary but not enough. You can find the article here: Reflections on the Second Noble Truth: It’s More Than Craving
Warm regards,
Insight Meditation of the Mid-Columbia