The School District of Philadelphia requires all students (beginning with the class of 2008) to complete a course in African and African American Studies in order to graduate from school.
http://www.phila.k12.pa.us/offices/afamstudies/

PBS Teacher Lesson Plans
http://www.pbs.org/teachers/search/

Human Trafficking
http://www.pbs.org/teachers/search/results.html?q=trafficking

Child Slavery
The Invisible Princess by Faith Ringold (A book for young readers)

Thomas Jefferson and Sally Hemmings
http://www.pbs.org/wgbh/pages/frontline/shows/jefferson/slaves/stanton.html

Discover School Teacher Lesson Plans
http://school.discovery.com/lessonplans/

Discovery Channel on Chattel Slavery
http://school.discovery.com/lessonplans/programs/slavery/

Slavery in America (teacher lesson plans)
http://www.slaveryinamerica.org/history/hs_lessonplans.htm

Technology:
http://www.teach-nology.com/themes/social/slavery/