Denise Sloan, associate director at the US National Center for PTSD, has produced many fine publications on therapeutic writing.  However I think she has surpassed herself with her most recent:

Sloan, D. M., B. P. Marx, et al. (2012). ...

                      (this blog post is freely downloadable as a Word doc and as a PDF file)

"Man cannot remake himself without suffering, for he is both the marble and...