We've been doing a study in my parenting class at church based on a program entitled "Love and Logic" parenting. I don't pretend to know all about it just yet as I've just got my feet wet so to speak. But I know that many people with children are looking for new resources as parenting is such a tough job. "Love and Logic" is based on teaching natural consequences to children and helping children to learn to solve their own problems. Here's a link to the site:
Love and Logic
Here's another link about parenting peacefully that lists some other resources as well as "Love and Logic."