Caroline Knapp's book is the best, I think. She is so brutally honest, and after reading her story, I really felt that if she could do it, so could I.
'A New Earth' and 'The Power of Now', both by Eckhart Tolle are amazing books.
'The Seat of the Soul' by Gary Zukav, fabulous for spiritual recovery.
'A Return to Love' and 'A Course in Miracles' by Marianne Williamson
'The Shadow Effect' by Deepak Chopra, Marianne Williamson and Debbie Ford teaches you how to embrace the dark parts of yourself and bring them into the light, rather than trying to bury them.
'You Can Heal Your Life' by Louise Hay