Dr. P's Home Page (as always, under construction)
IMSA Chess Team Materials
First of two articles on endgames basics from Chess Life can be found here.
Second of two articles on endgames basics from Chess Life can be found here.
Jeremy Silman's article of the Lucena position in rook endgames can be found here.
Jeremy Silman's article of the Philidor position in rook endgames can be found here.