Living Learning Books - Homeschool science curriculum and activity guides for a classical approach to education. - http://www.livinglearningbooks.com
Beginnings Publishing House - Rainbow Science - Homeschool science curriculum for junior high students written by Ph-D level scientists that are also homeschool parents. - http://www.beginningspublishing.com/products.html
Science in a Nutshell - Science unit study kits for grades 2 through 6. Available topics include Earth Works, Electricity and Magnetism, The Human Body, Simple Machines, Space Science, Water World, and Living Things. - http://www.delta-education.com/teachers/science/nutshellclusters.html
Homeschool Science Lessons - 150 online lessons in life science, earth science, chemistry, and physics available for purchase. - http://www.tchg.com/homeschool
Home Training Tools - Provides science fair projects and information, microscopes, curriculum, and related resources. From a Christian perspective. - http://www.hometrainingtools.com/
Homeschooling Science Fun - Articles and worksheets for the homeschooler. - http://www.suite101.com/welcome.cfm/homeschooling_science_fun
The Young Scientists Club - Subscription science curriculum developed by Harvard graduates for children ages 4-8. Children receive personalized science kits including lessons and materials. - http://www.theyoungscientistsclub.com/