This is a really great website packed with creative ideas for discussions and devotionals. It is aimed for Christian work in schools but is a really useful part of the arsenal for anyone looking for family devotional ideas, or for children's ministry or preteen teachers. The resources range from multimedia clips and discussion questions to flash cards and games.
Here's a link to a lesson about addressing the heart in all of our teaching. It's from a youth & children's ministry conference in the evangelical world. It calls us to go beyond managing behaviour into discipling the heart and whilst it understates the sense of mission that we are called to, uses some religious and secular language that makes it perhaps a little dry compared to our usual diet. It is worth persevering with, as it does give some food for thought when it comes to dealing with the hearts of the young people we disciple and lead.