Museum of Science Engineering is Elementary Units http://www.mos.org/doc/1546
ASEE Engineering K12 Center http://www.engineeringk12.org/educators/hands_on_learning/lesson_plans.htm
Building Big Educator's Guide http://www.pbs.org/wgbh/buildingbig/educator/act_index.html
ASME Engineering is for Everyone (Sounds and Music for Grades 3/4, and Machines and Tools for Grades 5/6) http://www.asme.org/Education/PreCollege/TeacherResources/Everyone.cfm
ASME Engineers Solve Problems Activities http://www.asme.org/Education/PreCollege/TeacherResources/Engineers_Solve_Problems.cfm
ASME Integrated Design Engineering Activity Series (IDEAS) http://www.asme.org/Education/PreCollege/TeacherResources/Integrated_Design_Activity.cfm
Children Designing and Engineering http://www.childrendesigning.org/home.html#
Children's Engineering Educators http://www.childrensengineering.com/freeresources.htm
Exploratorium Structures - Activities for the Elementary Classroom http://www.exploratorium.edu/structures/
Teach Engineering http://www.teachengineering.org/
PreK-12 Engineering http://www.prek-12engineering.org/
Center for Engineering and Computing Engineering Lesson Plans http://cece.engr.sc.edu/lessonplans.html