Because so many posts over the last years have involved discussion of dissociation, there have been many requests from practitioners for information about the use of EMDR with that population. At last, a book has been published for that express purpose:

2008. Forgash, C. & Copeley, M. Healing the heart of trauma and dissociation with EMDR and ego state therapy. NY: Springer Publishing.

In the name of full disclosure, I authored a chapter in the book.