Animals Australia have posted several videos to the web demonstrating the plight of factory farmed animals. This one deals specifically with pregnant female pigs:
This one is about factory farming in general and is narrated by the front man for Aussie band Kisschasy, Darren Cordeux.
This excellent film from the US details the human as well as animal cost of factory farming as well as providing some thought provoking information on pigs themselves.
The Pig Picture (Part One)
The Pig Picture (Part Two)
Here's an animated series which explains some of the politics and motives behind factory farming, based on the Matrix series.
Part two and a half.