Indeed. The popular book by Burns (http://www.amazon.com/Feeling-Good-The-Mood-Therapy/dp/03808...) in an earlier '80s edition before the behavioral angle was added made a significant and permanent improvement in my life, all done by myself, although with medicine and talk therapy added to the mix (my depression is not standard "unipolar affective disorder" and medicine is key to improving it, but not a complete solution).