"Philosophy for Children (enquiry based learning) offers a way to open up children's learning through enquiry and the exploration of ideas. Children learn that their ideas have value, and that the ideas of other children have value too. Through Philosophy for Children they realize that they don't always have to be right, but they gain the confidence to ask questions and learn through discussion." - Philosophy4Children
PLATO: Philosophy Learning and Teaching Organization
PLATO provides ideas, tools, and resources to help educators of all levels and subject areas integrate philosophy education into their classrooms.
Teaching Children Philosophy
Thomas E. Wartenberg, Professor of Philosophy at Mount Holyoke College, has been working with teachers on teaching philosophy for children.
Teaching Philosophy to Youth
John Hopkins Center for Talented Youth. Specifically for grades 7-12. Please check out their introduction to philosophy.