I have 5 service dogs in my family and I have found Delta Society to be a tremendous resource.
Delta Society is the leading non profit organization concerned with improving the human animal bond and they have lots of info on service dogs and trainers as well as all the laws in plain english regarding access, etc.
There mission and goals are:
Delta SocietyŽ Mission
Improving human health through service and therapy animals.
Delta Society Goals
Expand awareness of the positive effect animals can have on human health and development.
Remove barriers that prevent involvement of animals in everyday life.
Expand the therapeutic and service role of animals in human health, service, and education.
Here is a link to their site:
http://www.deltasociety.org/dsf000.htm