Simple+Machines

@http://www.edheads.org/activities/simple-machines/ - interactive, very kid-friendly, animated and fun! Option to explore simple or compound machines. Has sound.

@http://www.mikids.com/Smachines.htm - lots of photographs that show simple machines in real life (pulley, lever, wedge, wheel and axle, inclined plane, screw)

@http://dln.nasa.gov/dln/content/catalog/details/?cid=286 - NASA videoconference for simple machines