Great website for kids science
NOVA Education--hundreds of videos!
Corkboard Connections: Science Comes Alive with LabTV!
Captured: The First-Ever Images of Atoms Moving Inside a Molecule
Tons of great science interactives.
music box. Put on Smartboard when students arrive - they are silent as they watch and listen.
This site has TONS of science videos on everything from life, earth and physical.
All 100 episodes of Bill Nye the Science Guy