Justin Rhodes at Abundant Permiculture has some really good ideas about raising chickens. He does market aggressively. I didn't sign up for anything but looked at some of his promotional videos and suddenly I was getting two advertisement e-mails a day from him. I unsubscribed and it stopped immediately, and my email address doesn't seem to have been sold. Overall I'd say my experience was neutral, and I got some good ideas about giving my chickens access to my compost.
My chickens always have access to my compost. They just seem to know when the time is right to jump in and get filthy, and when to just ignore it and let it ripen a bit longer.