One of my favorite forms of art is sign painting. I love the style & letter forms along with the old school edgyness it implies. This upcoming video looks like fun.
There is a great book I bought some time ago that I really liked too. It has interviews with top sign painters and examples of their work. There is also a DVD that should come out soon.
Sign Painters, by Faythe Levine, Sam Macon and Ed Ruscha