One of my most favorite things about Downtown Los Angeles is the Fading advertising. You know when you look up and see an old sign for Sears downtown. When there hasn’t been a sears in downtown in centuries. Here are a couple of websites devoted to the dying art of fading advertising:
http://www.forgotten-ny.com/ADS/ADS%20HOME%20PAGE/adhome.html
http://www.flickr.com/search/?q=fading+ads