10 Downing Street PMs in History - Margaret Thatcher: Biography of Thatcher from the UK Prime Minister's official site.
Biography.com: Thatcher, Margaret: Includes a short summary of her life and political achievements, as well as links to biographies of related figures.
Booknotes: Margaret Thatcher: Transcript of a C-SPAN interview of Lady Thatcher discussing her memoirs, entitled "The Downing Street Years."
Britannia.com: Margaret Thatcher: Biographical timeline.
C-SPAN Booknotes: Chris Ogden: A 1990 interview with the author of the biography "Maggie: An Intimate Portrait of a Woman in Power," discussing both the writing of the book and its subject.
CNN - Interview with Margaret Thatcher - June 30, 1997: Transcript of Bernard Shaw's 1997 interview with Lady Thatcher discussing Hong Kong and Western relations with China.
Frontline: Interview with Margaret Thatcher: An interview on the PBS talk show on the prosecution and outcome of the 1991 Persian Gulf War.
General Election 3 May 1979 - BBC Politics 97: Report on the watershed 1979 election. Includes streaming audio of speeches by Margaret Thatcher and Jim Callaghan.
History Channel - Margaret Thatcher: A biography covering 1925-1995 published for Women's History Month.
Margaret Thatcher Foundation: Offers free access to the full texts of thousands of documents relating to the politics of the last quarter of a century
Margaret Thatcher, Britain's Prime Minister: A fan site which offers fun facts, timeline and list of famous deeds, and bibliography.
MSN Learning & Research Plus: Thatcher, Margaret Hilda: Online encyclopaedia article.
National Review: Margaret Thatcher and the Revival of the West: An article by U.S. President Ronald Reagan crediting Thatcher with inspiring and reinvigorating Western civilisation.
On Principle: Margaret Thatcher and the Rebirth of Conservatism: Article by Stephen Davies on Thatcher's role in the historical ideological divide, in the journal of the John M. Ashbrook Centre for Public Affairs.
TIME 100 - Margaret Thatcher: Biographical profile of Thatcher, from the series "Leaders and Revolutionaries" of the 20th century.