Retro Running World: Christian Grollé (France) - http://www.backward-running-backward.com/  

The Association Italian Retro Running: Giuseppe Angeli (Italy) - http://www.retrorunning.com/             

The International Retro Running: Roland Wegner (Germany) - http://www.retrorunning.de/ 
Brasil (Pablo Galleto) -  http://www.marchareversiva.com/

History of backwards running world records (Ralf Laue) 

http://www.recordholders.org/en/list/backwards-running.html                                                 

Hot under the Collar Productions

Wacky Nation - Crazy and mad sports and contests in Britain, co-founded by James Bamber

The Paddy Games - Olympic style sporting event where silliness is taken very seriously.  Includes backward running events and much much more!