The Constitution for Kids http://www.usconstitution.net/constkidsK.html 
Age appropriate information for grades K-12

Ben's Guide to U.S. Government for Kids - http://bensguide.gpo.gov/k-2/index.html
Lots of information for students and teachers.

Teaching the Amendments http://www.congresslink.org/print_lp_teachingamends.htm 
Lesson plan for grades 7-12.

Constitution Day http://www.constitutionday.us/
Links and information for students, teachers, military, etc.

Constitution Day Resources for Educators http://www.gmc.edu/library/Constitution_Day.htm
Classroom activities, discussion starters, and lesson plans.

Charters of Freedom http://www.archives.gov/national-archives-experience/charters/charters.html 
This site from the National Archives includes readable text of the Declaration of Independence, Constitution, and Bill of Rights, along
with biographies of the men who signed the Constitution. (Grades 6-12)

Bill of Rights Institute http://www.billofrightsinstitute.org/Instructional/Resources/ConstitutionDay/index.htm 
The Bill of Rights Institute is offering free educational and programming materials to schools to help teachers organize events to
commemorate Constitution Day.

CQ Press: Celebrating Constitution Day http://cqpress.com/incontext/  From the Congressional Quarterly.
Free content and lesson plans to honor National Constitution Day.

The Constitution: Counter Revolution or National Salvation? http://memory.loc.gov/learn/lessons/broad/intro.html 
Lesson plan for high school students.

In Congress Assembled: Continuity and Change in the Governing of the United States
http://memory.loc.gov/learn/lessons/constitu/conintro.html Unit of four lessons using primary resources that examine continuity
and change in the U.S. Government. (Grades 7-12)

MSD Perry Township Media/Technology Indianapolis, Indiana