Okay, so I thought this might be of interest to you all:
There is a book called Sign Painters that came out several months ago by Faythe Levine and Sam Macon. Faythe Levine was the one who made that documentary called Handmade Nation. They have also made a movie called Sign Painters as well and there will be a free screening at UCLA Fowler Museum on July 25th (for folks living in Los Angeles, Orange County, Ventura County). There are screenings in other cities of the world as well.