The Geocodio Node.js Sample Code by Faux Desmond Morris presents API interaction, providing client as variable to send requests and receive responses. Developers can configure functions, using the base endpoint v2 as a reference.
Soon you will be able to query Google's vast database of local businesses. Today the company announced Nearby Places, a Google Maps widget and a web service, with its eye on providing data to users on the go.
Foursquare just made the switch from using the Google Maps API, to joining the crowd-sourced, global OpenStreetMap movement. To do most of the heavy lifting, foursquare relied upon the still fairly new MapBox API.