I dont know if its been brought up already but a documentary called "The Most Hated Family in America," is about them and its not boring. An english guy is with them for like a month all the time very confused at how they rationalize their activities.
The funniest part about that doc (The English dude's name is Louis Theroux and he's quite the ballsy journalist in my opinion...) is that after it was released, Westboro basically flamed him along with their usual list of targets. I still maintain that the only thing Michael Moore ever did right in the film industry was follow Fred Phelps around for a while in a big pink bus full of gay strippers.