ePodunk (the power of place) is an online location resource for the US. It lists newspapers, events, geneology, restaurants, lodging, weather, photos, obituaries, government, census, history, health, and much, much more. Let us sum it up by saying "comprehensive".
They license access to their databases (which are really just a conglomeration of hundreds of other databases). I'm trying to find out if the API is accessible to tie into other web apps.
Update: - ePodunk has chosen to close off their API and doesn't even currently license their technology to users/vendors. This requires people to travel to ePodunk to get information. I can understand the need for a revenue base, however, charging a license or obtaining some other means of revenue generation while opening up an API seems beneficial.
Perhaps they should check out the O'Reilly talk on how an Open API can greatly help your emerging business, Web Services as a Strategy for Startups: Opening Up and Letting Go.