Check out this website: http://www.salemchickens.com/Research_Packet_Jan_2010.pdf
I have not found this before in my searching but it was listed in the
back of the Grit: Guide to Backyard Chickens I picked up yesterday at
the Tractor Supply Store.
The packet in the above website is kind of a "how to" guide to getting
the ordinance changed. Thought it would be a good reference.
It looks like they are open to other groups using it / modifying it to
their own cities.
Have a great day!