Edheads: http://www.edheads.org/activities/simple-machines/
Museum of Science: http://www.msichicago.org/fileadmin/Activities/Games/simple_machines/
Simple and Complex: http://sunshine.chpc.utah.edu/Labs/Machines/
The Essence of Simple Machines: http://www.cosi.org/downloads/activities/simplemachines/sm1.html
Rube Goldberg: http://pbskids.org/zoom/games/goldburgertogo/
Robot Simple Machines: http://www.wonderville.ca/asset/robot-factory
Museum of Science: http://www.msichicago.org/fileadmin/Activities/Games/simple_machines/
Simple and Complex: http://sunshine.chpc.utah.edu/Labs/Machines/
The Essence of Simple Machines: http://www.cosi.org/downloads/activities/simplemachines/sm1.html
Rube Goldberg: http://pbskids.org/zoom/games/goldburgertogo/
Robot Simple Machines: http://www.wonderville.ca/asset/robot-factory