MLB.com- Negro Leagues
http://mlb.mlb.com/NASApp/mlb/mlb/history/mlb_negro_leagues.jsp
Major League Baseball web site includes an extensive section on the Negro Leagues under the heading history. Contains biographies, articles on barnstorming and segregation, a photo gallery and a section with audio and video interviews with former players.
Referenced in:
Baseball In Pennsylvania
On the Other Side of the Color Barrier: Segregation and the Negro Leagues