HBO's programme "Death on a Factory Farm" aired on Monday March 23. It tells the story of a really courageous young man who went undercover on an Ohio pig farm. He documented everything he saw, including the hanging of a pig.
There are details of the programme on the Humane Farming Association's website:
http://www.hfa.org/campaigns/wiles_update11_07.pdf
There are four short video clips on a blogspot.
http://beaelliott.blogspot.com/2009/03/hbo-death-on-factory-farm-caged-pig.html
A big thank you to the Humane Farming Association and to HBO for having the courage to air the show.