http://www.brainpopjr.com/science/forces/magnets/preview.weml
http://www.brainpop.com/science/motionsforcesandtime/magnetism/preview.weml
http://www.bbc.co.uk/schools/scienceclips/ages/7_8/magnets_springs.shtml
http://www.apples4theteacher.com/games/magnets.html
http://science.pppst.com/magnets.html