NeoK12 offers a set of YouTube videos explaining and illustrating temperature, measurements of temperature, heat, conduction, convection and transfer. All videos and lessons on this site have been reviewed by K-12 teachers and are safe for kids.
The site has a video providing a brief elementary explanation of the concept of heat conduction. It requires QuickTime to run. The accompanying activities explore the movement of heat energy and how effective different materials are at conducting heat.
LearningReviews.com is a directory of mostly free interactive K-12 educational resources for parents, teachers and students. Fee-based resources included here are award-winning or highly rated by education and parent organizations.