Find A Grave: William Congreve: Photographs of the his final resting place in Westminster Abbey, links to those buried nearby, and interactive visitor comments.
Moonstruck Drama Bookstore: William Congreve: Biography, plus links to all of his works currently in print.
TheatreHistory.com: William Congreve: Biography of the English dramatist, by Algernon Charles Swinburne in the Encyclopædia Britannica, 11th ed.