From the New York Public Library. This is an amazing collection full of images and essays that provide an excellent overview of colonialism, independence, and African thought of the 20th century.
A comprehensive history of the colonial history of Africa and the move towards independence. Profiles case studies of Guinea, Algeria, Congo, and Kenya but a great introduction for everyone.
A fantastic site from the editors of JSTOR and the Google Cultural Institute. This site contains primary sources, photos and a comprehensive history of the struggle for independence in Mozambique.