Audax Club Parisien (ACP) -- organizer of the Paris-Brest-Paris grand randonnée.
Les Randonneurs Mondiaux -- Ultra long-distance cycling.
Paris-Brest-Paris -- PBP 2011!
Bangalore Brevets -- The Bangalore Bikers Club Randonneuring Group
Seattle International Randonneurs
Veloweb.ca -- Raymond Parker's blog on cycling, especially on Randonneuring.