The Highly Sensitive Person by Elaine N. Aron, Ph.D.
The Invisible String by Patrice Karst. A great book to read to kids dealing with separation anxiety.
The Kissing Hand by Audrey Penn. A great book to read to kids dealing with separation anxiety.
The Missing Mommy Cure: Helps Relieve Separation Anxiety by Midge Leavey. A great book to read to kids dealing with separation anxiety.
Parenting Young Children: Systematic Training For Effective Parenting Of Children Under Six by Don Dinkmeyer, Gary Mckay, James S. Dinkmeyer A great introduction to systematic training for effective parenting (democratic style). There are more of the same for parents of older kids too.
Feel the Fear and Do It Anyway®: Dynamic techniques for turning Fear, Indecision and Anger into Power, Action and Love by Susan Jeffers, Ph.D.