I've just had my first successful broody experience, I just recently bought chickens (adults), one roo and 4 hens, and the day they came home one of the hens went broody and now has little chicks running around her (3), I researched on here and found that it was possible to just let the hen do her thing (and why not? they've been doing it for centuries), and she did perfectly well.. She hatched, and has been raising the chicks in with the whole flock, and let me tell you, a broody hen or new mother will make SURE noone hurts her chicks. I watched her ceremoniously bring her new chicks out to the run for the first time the other day, rooster saw a chick and went for it, and that hen put a pounding on him! Now, he is protecting the little one's so I'm not sure if he just needed some sense knocked into his head (they are his own chicks, he's the only rooster out there).
I now have another hen who is setting, I didn't realize what she was up to until I felt it was too late to take her eggs, so she will likely be a new mother in a couple weeks time.