US National Archives
Nara: u.s. Electoral College: u.s. Electoral College
National Archives and Records Administration home page on the U.S. Electoral College. Contains details on historic voting patterns as well as technical details on procedures.
New York Times
New York Times: Crossword Puzzle: The Electoral Process
Twice a month you can play a new crossword puzzle on The New York Times Learning Network. This one is called "The Electoral Process."