PBS Parents is a great site for teachers to use with their own students and to share with parents of younger students.
The site contains information and resources on early childhood development, fun and games, education and your child, and much more.
There are games and activities to help young children learn and develop properly.
The education section has tips on finding appropriate books for different ages and gives parents (and teachers for that matter) tips on helping children learn math and science. Some of the science activities are really well designed and can be done at home. The science concept is related to everyday things, like cooking, and can stimulate their interest in science.