I've written a number of articles about various aspects of chess for young children. You can read some of them here.
FOURTEEN FALLACIES ABOUT JUNIOR CHESS
CHESS, PIAGET AND POLGAR
CHESS THINKING SKILLS IN CHILDREN
THE GIFT OF CHESS
CHESS AND SPECIAL NEEDS EDUCATION
MY POSTS ON GM NIGEL DAVIES' CHESS IMPROVER BLOG
RICHARD INTERVIEWED BY JUSTIN HORTON