RaceBridges for Schools (www.racebridgesforschools.com
Teaching Tolerance (http://www.tolerance.org/) offers lessons on social justice across different oppression (sexism, racism, environment, poverty, family/homophobia, etc.)
Quiz on Native Americans
Ed Change (http://www.edchange.org) free handouts for a variety of differnet workshops, trainings, and classes. Professional development, research, and resources for diversity, multiculturalism, and cultural competency.
Some of Claudia's THINKING on Teaching (in general).
Thanksgiving lesson plans and ideas