You can now bring the power of MapQuest routing to your application, whether it runs on a server or in the browser. The granddaddy of mapping announced a Beta release of a brand new web service for driving directions.
There are any number of questions that can be answered by Wikipedia, but you can add "where am I?" to the list. Given any latitude/longitude coordinates, the WikiLocation API will find you corresponding Wikipedia articles to tell you about your surroundings.
After months of anticipation, Facebook officially launched its Places feature to check-in to nearby locations and share the place with your friends. The launch includes an API extension to its Graph API, which will first be read only. Launch partners include location-sharing platforms Foursquare and Gowalla, which are part of a private beta for the upcoming read/write API.