The World Parrot Refuge provides a home for over 700 parrots that have been turned in, abandoned or rescued. The birds are allowed to live out their lives among their own kind and in more free-flight space than they could ever be practically allowed in a typical home situation. Check out their informative video:
In Little Birdies!, Dan Grant has his own, perhaps slightly more exotic, private parrot refuge, and is driven by the same motivations of those good folks who do it for real. He does end up with a bit more than he bargained for, though. You can read sample chapters here.