Biographies
Links
Descartes
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Descartes.html
Biography of Ren Descartes from the MacTutor History of Mathematics archive.
Ren Descartes - A Brief Life Sketch
http://members.tripod.com/s_kichu/descartes.html
Brief outline of Descartes' life and achievements, with some interesting sidenotes.
Catholic Encyclopedia: Ren Descartes
http://www.newadvent.org/cathen/04744b.htm
Biographical article from the Catholic Encyclopedia.
Descartes: A New Way of Thinking
http://ambafrance-ca.org/HYPERLAB/PEOPLE/_descart.html
An overview of Descartes' life and works.
Island of Freedom: Ren Descartes
http://www.island-of-freedom.com/DESCARTE.HTM
Biography and selected links.
Ren Descartes' Life and Works
http://plato.stanford.edu/entries/descartes-works/
Biography from the Stanford Encyclopedia by Kurt Smith.