These are two excellent resources documenting the Bullfighting and its History.

THE HISTORY CHANNEL

• Bullfighting
• History
• The Spectacle And Its Principals
• Realities Behind The Spectacle
• The Great Matadors
• Bullfighting Outside Spain
• The Corrida In Art And Literature

THE ENCYCLOPAEDIA BRITANNICA ONLINE

• Introduction
• Origins And Early Forms
• Development In The Modern Era
• The Rise Of Professional Bullfighting
• Bullfighting At The Turn Of The 21st Century
• Bulls And Bullrings
• Performers
• The Spectacle
• Act One
• Act Two
• Act Three
• Bullfighting And The Arts
• Additional Reading
  

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ALSO VISIT Wikipedia.com's article on bullfighting.