Foursquare, the leading location-based social tool, announced a major new initiative last week to expand its location database to include cross-references to corresponding venue listings from other services. As characterized in the announcement post on the company blog, the goal is to make Foursquare the missing "Rosetta Stone for location, allowing you to link information about a real-world place from one database to any other." Now it's not just about using Foursquare, but connecting it to other services.
Brady Forrest over at O'Reilly Radar has a new post that highlights an unofficial release of preliminary API for Latitude, Google's geo-location sharing service. Although the API has not been formally identified by Google, the API can be seen in use in two new apps: the new Google Location Blog Badge and Google Talk Location Status.