PBS Kids - This is a great website for science-related computer games your child can do at home.
BrainPop - This site separates science concept into informative short videos, there are games and activities connected with each concept. BrainPop Jr. is great for elementary children, BrainPop is great for intermediate and middle school students and there is BrainPop ESL for new English Learners.
Science Bob - Provides ideas and guidance for science experiments at home and science fair projects.
Science Gifts
Arbor Scientific - Great site to find gifts the young scientist at home.
Edmund Scientific - One of the oldest resources for science equipment.
Fat Brain Toys - Great online store for science gifts, organized by topic.