Have any of you seen the new movie "Temple Grandin"? It's really good. It's about the real-life autistic girl Temple Grandin and, while it's not the main focus of the movie, it shows how she developed more humane ways of leading cattle to slaughter that are still widely used today.

It's not for the faint of heart because it does show cattle drowning and being slaughtered, but overall it's a very good film in my opinion.