http://www.youtube.com/watch?v=ITTxTCz4Ums
I watched the whole video, and participated in the mindfulness meditation exercise.
I have to say that after listening to the whole lecture, I have the same misgivings Sam Harris has about being removed from any thoughts or judgments about the external world. There is genuine suffering in the world that it is important to do something about. There is a tension between getting in touch with the present moment and using a meaningful part of each day to solve problems and help our fellow human beings. Having lived in a predominantly Buddhist society during two different three-year stays as that society transformed from Third World colonialized poverty to First World free and democratic modernity, I'm not at all sure that most people would be more happy if most people were doing more mindfulness meditation.