A colleague of mine recommended these little interactive self-help workbooks to help children cope with anxiety, negativity, anger, problems with sleep, and OCD. The author uses lively metaphors and illustrations to make the concepts and strategies easy to understand. The author is Dawn Huebner, Ph.D.. She is a clinical psychologist specializing in the treatment of children and their parents.
I highly recommend these titles and they are available at Chapters/Indigo and at Amazon.
What to do when you Worry too much (for anxiety)
What to do when you Grumble too much (for negativity)
What to do when your Temper flares (for anger)
What to do when your Brain gets stuck (for OCD)
What to do when you Dread your bed (for sleep problems)
I have used them in my own practice and find them quite useful and helpful to both the parents and their children.