Enchanted Learning http://www.enchantedlearning.com/subjects/astronomy/
NASA http://www.nasa.gov/audience/forstudents/5-8/features/index.html
Virtual Solar System http://www.nationalgeographic.com/solarsystem/ax/low.html?2d
Views of the Solar System http://www.solarviews.com/eng/
World Almanac for Kids Solar System http://www.worldalmanacforkids.com/WAKI-ViewArticle.aspx?pin=wwwwak-184&article_id=536&chapter_id=12&chapter_title=Science&article_title=Astronomy
netTrekker http://school.nettrekker.com