I really liked the share on this NN article:
http://www.aviculture-europe.nl/nummers/08e04a04.pdf
The most interesting thing to me was the observation that the Naked Necks were the only ones able to survive in Africa's extreme heat. Sure does back up my personal experiences raising them here in AZ.
My only issue with this article is the claim that NNs don't lay 200 eggs per year. One of my girls alone, and she's not exceptional in my flock, has laid 212 eggs since Feb 29th of this year, and she's in her second year of laying AND her eggs are always 2.3 ounces or bigger AND she laid straight through molt. I get 4-6 X-Lg eggs from her per week with no artificial lighting, and she's not even my best layer!