European Navigator from the Centre Virtuel de la Connaissance de l'Europe is a brilliant site offering a huge multimedia archive about several European historical events and European institutions.
Österreich und die Europäische Integration.
Council of Europe Audio Archives of key-personalities embracing 50+ audio clips of speeches covering half a century
Council of Europe: The Saar Question A collection of documents covering discussions on this disputed territory (claimed by both France and Germany) over the period 1949-1957
BBC Milestones of the EU Timeline plus collection of video fragment
European Councils 1974-1989 in French And 1990-1999
European Councils in all languages since 1985
Foreign Relations of the United States
G8 Information Center (University of Toronto) for a good starting point.
Instituut Nationale e l’Audio-visuel, 50 l’ans de construction européenne has eleven video extracts
Leiden University’s Schuman Plan Collection
LeMo Archiv A large and varied sound archive
NATO on-line Library
NATO Basic Documents
NATO Summits and Ministerial Communiqués from 1945 to the present
The Single Currency and the European Parliament (European Parliament) covers debates and resolutions from 1989 onwards
Truman Library Marshall Plan Study Collection
Western European Union Key texts from 1984 onwards