Our API directory now includes 82 address APIs. The newest is the 1Map API. The most popular, in terms of mashups, is the geocoder API. We list 41 geocoder mashups. Below you'll find some more stats from the directory, including the entire list of address APIs.
Google Maps API is the most popular tool for building location-based services. Now, the Google Maps Operations team is leveraging their experience to collaborate with Udacity and create a free course that teaches students how to integrate maps and location features into websites.
There is a new wave of mapping APIs that are helping developers provide better location feedback to users. These "reverse geocoders" do more than just return an address. Instead, they provide meaningful names associated with the place, such as a business. In some cases, it gets even more specific.