Backward running sites and information.
Hundreds of persons in the United States begin backwards running because of its numerous and appreciable benefits: better oxygenation (84% VO2 in backward running vs. 60% VO2 in forward running); cardiovascular system increases (184 pl/mn vs. 162 pl/mn); it burns one third more calories than forward running; it develops considerable balance, velocity and stamina; it works more quadriceps than forward running; it reduces the ground impact; it promotes a greater flexibility of the body; and it reduces the risks of injuries. The benefits are so numerous that new books will not delay being published on the subject.
http://www.runtheplanet.com/resources/historical/backwards.asp
http://www.backward-running-backward.com/PDF.Stevenson.pdf
http://backward-running-backward.com/