Central Intelligence Agency: 
Although chiefly intended as a public information web site, this one does provide some historical material on line -- especially on controversial episodes -- and it also accesses the Agency’s very useful World Factbook.

CNN Cold War Documentary: 
CNN’s 24 hour television documentary is the most thorough visual history of the Cold War, especially valuable for its interviews with participants, both lofty and ordinary. This web site contains various materials on each of the episodes and some nifty graphics; for the full text of interviews, see the National Security Archive web site, above.

Cold War Connection:
Developed by the Cold War Science and Technology Studies Program, this site's strongest feature is its extensive list of Cold War bibliographies. This page also includes an annotated Cold War Filmography and an annotated list of about 30 linked sites.

Cold War Era: Records and Research at the National Archives and Records Administration

Cold War International History Project (CWIHP):
Located at the Woodrow Wilson International Center for Scholars in Washington, CWIHP is the principal center for translating and evaluating newly-released documents from the former Soviet Union, Eastern Europe, China, and other states normally thought of as having been on the “other side” during the Cold War. On this web site you will find electronic editions of its now famous Bulletin, the single most important source for the “new” Cold War history.

Department of State Foreign Relations Series:
Published since 1861, the Department of State’s series Foreign Relations of the United States has long been the principle published collection for documents relating to American foreign policy. For the period after World War II, it also includes documentation from such agencies as the Defense Department, the National Security Council, and the Central Intelligence Agency. It’s by no means complete -- perhaps only 1-2% of what’s in the archives. But it’s excellent as a starting point, and as a guide to the archives. Recent volumes, mostly dealing with the 1960s, are available on line; all published volumes are in Mudd.

Harvard Project on Cold War Studies:
A new program based at Harvard’s Russian Research Center that seeks to supplement the efforts of CWIHP and NSA by linking them to the resources of a major research university. Publishes the new Journal of Cold War History, the first refereed journal to specialize in Cold War studies.

H-DIPLO:
H-DIPLO is the major Internet discussion group for all aspects of international history, but it has a heavy Cold War emphasis. Signing up for it is a good way of keeping track of debates within the field, as well as information on conferences, archives, and other web sites of interest. The address above is the H-DIPLO archive, where you can find past discussions grouped by subject.

National Security Agency:
Not to be confused with the National Security Archive, linked below, the NSA-- the government's top-secret code-breaking unit -- has an interesting website with material on the Cuban Missile Crisis and the VENONA intercepts, which document early Cold War Soviet espionage efforts inside the United States.

National Security Archive:
This non-official organization (not to be confused with the National Security Agency), specializes in seeking the declassification of United States government documents from the Cold War period; but it also works closely with CWIHP and serves as the archival depository for its materials. Also contains the full text of interviews done for the CNN television documentary Cold War.

Parallel History Project on NATO and the Warsaw Pact:
The twenty partner institutes of the project collect, analyze, and interpret formerly secret governmental documents in response to the declassification of NATO records and the steadily growing availability of documents from archives in Eastern and Central Europe. Since its establishment in 1999, the project has collected thousands of pages of material on security-related issues of the Cold War, published a large number of online documentaries on central issues such as mutual threat perceptions and alliance management, and organized several major international conferences on war planning, intelligence, and intra-bloc tensions.