I wrote about Parkour on July 29 in this article. I have since found that American Parkour is probably the best all around site for Parkour.
It has forums, detailed explanations and videos or pictures of exercizes, good quality responsible stories and articles offering howto information for building tools for training, how to take care of yourself and avoid injury, etc.
Colorado Parkour is also very good and is focused on the community in Colorado. More local sites are cropping up across America, so if you are interested in Parkour, just look around. The scene will be small, but it’s there and it’s growing, thanks to the dedication of the hardworking people running these sites and contributing to the community.
One hard thing for people to overcome here in America is that when Traceurs are seen overcoming obstacles in an urban environment, security guards, Police and concerned citizens tend to see these people in the same light as they would vandals, miscreants, skaters etc. I think the biggest obstacle Traceurs have to overcome is that they are very young, usually being teenagers or young adults, and people see that as a danger.
So it is important for Traceurs to be conscious about the environment and try to leave places in a better state than they found them.