4 links
ARTFL Encyclopedie
lib.uchicago.edu
Project to prepare an online edition of Diderot's Encyclopedia. The text itself is available only to subscribing institutions.
Denis Diderot Biography
people.brandeis.edu
Three biographical essays, by John Dunkley, C.A. Sainte-Beuve, and Jean Starobinski, on this key Enlightenment thinker.
Murphy's Law: Denis Diderot
infidels.org
An article by John Patrick Michael Murphy on Diderot's philosophical project and motivations.