Astronomy Interactives - This site provides ranking tasks for teaching introductory astronomy. Pencil-and-paper versions as well as computer-based versions are available grouped by topic. Middle-High School depending on subject matter.
NASA Space Place - An interactive sight to explore earth and space for elementary aged students.
Simulations and Animations - Flash animations and simulations for astronomy education. Topics include seasons, moon phases, coordinate systems, light, and more.