The Digital National Security Archive contains declassified U.S. government documents from 1945 to today.
The latest additions to the collection are:
Peru: Human Rights and Democracy 1970-2000
The Kissinger Telephone Conversations 1969-1977
The National Security Agency: Organization and Operations, 1945-2009
The U.S. Intelligence Community after 9/11
The United States and the Two Koreas: 1969-2000
The next collection of documents to be released in November is:
Colombia and the United States: Human Rights, Narcotics and the Dirty War in Colombia, 1960-2010