Reports and Statistics
ERIC Digests - Contains short reports on many educational topics; also useful for legal research.
Digest of Education Statistics - Contains statistics from 1995 to the last year.
National Center for Educational Statistics - Operated by the U.S. Department of Education and the Institute of Educational sciences.
Schoolmatters.com - Provides state-by-state performance, spending, and demographic information, as well as additional information. Also provides the ability to directly look up a district or school's data.