Yahoo has created what it calls the “GeoPlanet Explorer”, based on its geo platform API. The project utilizes Yahoo’s Geo Planet data such as:

- Placenames
- Latitude and longitude info
- Hierarchical info about places

Developers can simply go to the Yahoo Developer Network and go to the Geo section, and retrieve the API and/or the dataset for Geo Planet. The Geo Planet explorer was created to show more ways to use the data.

Source code for the project is available here.