You can access the database using the map on the left menu bar, or by clicking on this link : http://drkenjones.com/webPageUSMap.php
For those of you who have not seen the site, there are approximately 8000 ghost signs from around the United States. I still have around 800 that I have not yet added to the database. I have photographed them all myself.
The site used to provide a map showing sign locations, but Google now charges me for that service, so I have deleted it. You still have access to Google Street View, as well as the lat/lon for most signs.