Project on Government Secrecy (Federation of American Scientists)

Seeks to challenge excessive government secrecy and to promote public oversight of intelligence and national security policies.
http://www.fas.org/sgp/index.html

Above Top Secret - Uncovering Government Secrets

Government projects and facilities, including the notorious Area 51 in Nevada, as well as "Alien-related laws", government contractors, agencies and aircraft projects, such as the famous Aurora hypersonic spyplane.
http://www.abovetopsecret.com

The National Security Agency Declassified: History, Organization and Operations

Declassified documents on the history, organization and operations of America's most secretive spy agency and the controversial ECHELON intelligence sharing program.
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB23/

Government Secrecy

Examines government secrecy in the Bush Administration after 9/11 and the damage of that secrecy on the Freedom of Information Act and the public's right-to-know.
http://home.nc.rr.com/foia/