Our API directory now includes 146 location APIs. The newest is the LongLatToLocation API. The most popular, in terms of mashups, is the foursquare API. We list 86 foursquare mashups. Below you'll find some more stats from the directory, including the entire list of location APIs.
Google will deprecate its Google Maps Data API in January, lending support instead to its popular new Google Fusion Tables API. Both store geographic data and allow developers to access it programmatically. The move to discontinue support of the Maps Data API does not affect the Google Maps API, the third version of which Google sent into production in May.