http://www.backyardchickens.com/

http://www.thecitychicken.com/

http://www.squidoo.com/BackyardChickens

http://urbanchickens.org/

http://www.wikihow.com/Keep-Chickens-in-a-City

http://www.urbanchickens.net/

http://www.chickenkeeping.com/

http://www.motherearthnews.com/eggs.aspx

Want to hear some happy hen noises? (I don't think these are City Hens, it seems like they have some free range, but this gives an idea for what maximum sounds you can expect out of a small flock. Notice the background noise levels compared to these sweet hens!)