ACM SIGGRAPH
Computer Graphics organization, bringing together scientists, engineers, artists and entrepreneurs, dedicated to the advancement of the Computer Graphics industry. Includes annual conferences, publications, local chapters, resources and job listings.
http://www.siggraph.org/
Wikipedia: Computer Graphics
A comprehensive overview of Computer Graphics. Provides history, basic principals, and a breakdown of computer graphics categories. Includes descriptions of raster, vector and volumetric rendering.
http://en.wikipedia.org/wiki/Computer_graphics