Shodor Education Foundation
Shodor: Newton Raphson Method
This page offers an explanation of the Newton-Raphson Method for finding the roots of a function. Includes both graphical and textual information and provides links to an online interactive tool for finding function roots.
University of St. Andrews (UK)
University of St. Andrews: Joseph Raphson
This University of St. Andrews page offers a good biography on Joseph Raphson, an English mathematician and philosopher(1648-1715.) Discusses his life and his contributions to these fields.