http://nces.ed.gov/
Site of the National Center for Education Statistics, a government effort to collect and analyze data about education in the United States and other nations.

http://www.askeric.org/
Access to ERIC, the comprehensive collection of research and ideas about education.

http://www.edweek.org/
Site of Education Week on the Web, a weekly journal with news, evaluation, and analyses of all aspects of American education.