The Land use issue is hotting up all around the world, with a recent discussion on the Thumpertalk.com bulletin board here containing this link from the LA Times..
http://www.latimes.com/news/local/la-000023845apr03.story
And a few extra useful links also being posted:
http://www.sharetrails.org
http://www.responsiblerecreation.policy.net/home/
http://www.corva.org
And we have a few here in Australia also:
http://www.dsmra.asn.au/wilderness.htm
http://www.eatmydirt.com.au/community/boxironbark.htm
This is a major issue to our sport.
Please be careful and considerate of others, and of the land itself when you ride