The Voltaire Society of America
http://humanities.uchicago.edu/homes/VSA/
Dedicated to the promotion and dissemination of Voltaire's work and legacy in American academia. Includes resources pertaining to Candide.
Voltaire Foundation
A bilingual website (French/English) featuring electronic texts of Voltaire's major works and a comprehensive set of links to other national and regional research centers dedicated to Voltaire's oeuvre.
Voltaire (1694-1778)
http://www.malaspina.com/site/person_500.asp
Everything you wanted to know about Voltaire, but were afraid to ask. At the end, includes a helpful division of his heterogeneous writings into five distinct generic categories: theater, poetry, prose, historical, physics/metaphysics.