I actually did most of the major revisions on that article a few months ago, but didn't finish the second half. I still think the first part could be better, but the end really needs more organization, clarification, and neutrality. I encourage anyone to contribute to Wikipedia in their areas of knowledge and expertise, just try to be as sure as possible of your accuracy, and keep the tone neutral. Or post on the "discussion" pages. The arborist discussion page has nothing yet, basically, but on many pages it can help the evolution of entries. Maybe this reminder will get me to work on it some more, or encourage others?
If you haven't checked it out, it really is a great source of information on a great number of things, and it's fun to just browse randomly around.