Alberto Mendes, Manuel Lemos, and Mr. Franks performing Portuguese songs and music from the Azores, 1939: A collection of recordings of Portuguese songs and music made in 1939 by Sidney Robertson Cowell in Richmond, California; includes descriptive notes and audio samples.
Chasing the Fado: An article by an enthusiast for "those Portuguese Blues"; includes discography and resource lists.
Coimbra Fado: Wikipedia article describes the style of Fado which developed in the university town of Coimbra.
Fado: From Wikipedia, the history of this Portuguse folk music characterized by mournful tunes and lyrics.
Fado - The People's Soul: The origins of Fado, with photographs, sound samples, and essays on the Portuguese guitar. [bilingual]
Fado Music: World Music Central - article describing the characteristics of Fado.
The History of Fado: A history and description of a music which has become a world wide symbol of Portugal.