My Pet Chicken website is a useful American website with some excellent information. Worth a trawl through especially the Frequently Asked Questions.
Suburban Chickens is a good reference website for every aspect of eggs and chicken rearing.
Back Yard Chickens is an all-round chicken facts website and worth a look.
WIKI is always a good reference source if not only for the links to other sources of information about every aspect of chicken life and egg production.