An old but excellent review of the empirical literature on the effects of mindfulness on psychological health including a discussion of the construct of mindfulness, the differences between Buddhist and Western psychological conceptualisations of mindfulness, how mindfulness has been integrated into Western medicine and psychology, and a discussion on the mechanisms of change in mindfulness interventions.
(1) Clin Psychol Rev. 2011 Aug;31(6):1041-56. doi: 10.1016/j.cpr.2011.04.006. Epub 2011 May 13. Effects of mindfulness on psychological health: a review of empirical studies. Keng SL1, Smoski MJ, Robins CJ.