Many games for teaching science - complete with teachers' notes and instructions. Includes the chance to create your own planet by tailoring conditions. Plus some just for fun.
1/9/07 - Currently in its infancy, this NESTA backed site will become a decent resource very quickly because it aims to host a wealth of science experiments, demonstrated by serving teacheras, on digital video.
26/8/07 - Teachers' section of this well-designed and accessible site. Lesson plans and resources relate to our solar system's planets (plus Pluto!) and the sun.
Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
It is being used in planetarium projectors. Just set your coordinates and go.
26/8/07 - The official NASA website with loads of information on space exploration and the planets. Plus, there's a great teachers' section with interactive games and other useful resources.