Other
Cambridge University: The History of Salsa
A good introduction to the history of Salsa music and dance, covering all the periods of Salsa dance.
Other
Recreation Arts Dance: Salsa vs. Mambo
An article discussing the similarities and differences between Salsa and the Mambo, both Latin American dances. The article mainly discusses the steps of both dances, but has some information about the style and feel of the music.