http://www.naacp.org/
Site of the National Association for the Advancement of Colored People, with the latest news on racial issues and a variety of other resources.

http://www.census.gov/
The U.S. Census Bureau site, with special reports and comprehensive statistics on racial/ethnic groups.

http://www.hrw.org/wr2k1/special/racism.html
Information on race problems throughout the world by the Human Rights Watch.