National Gallery of Art
National Gallery of Art: Gemini Artist Workshop 1966 1996
An invaluable site showing works and discussing artists who were part of the Gemini Artist Workshop. Artist include David Hockney, Andy Warhol, Nancy Kienholz and over 50 others.
Art Cyclopedia
Artcyclopedia: Artists by Movement: Minimalism
A brief description of Minimalism, including a list of famous Minimalist artists. There are links to Minimalist artists and exhibitions of their works, often with commentaries or reviews.