There is an ongoing debate in the Mountain Bike Advocates circle around how to approach the use of mountain bikes on public lands designated as wilderness.
One one side of the table sits IMBA, and on the other the Sustainable Trails Coalition. Let me clarify by saying that both groups are fighting to get mountain bikers access to wilderness areas but they are on opposite sides of the spectrum as far as their respective strategies.
Drew Sanford, @Cotharyus, hosts Trail Cast, a trail advocacy podcast on Mountain Bike Radio and recently did an episode on the differences between the two groups. More importantly though, how Mountain Bike Riders as a whole need to support both organizations and stay united as a group to succeed.
It's just under an hour long but worth listening to. Here is the link to the episode.