Online mapping pioneer MapQuest is using open data to provide transit directions via its MapQuest Directions API and the OpenStreetMap-based MapQuest Open Directions API. In both cases, transit directions are based on the Google-created GTFS data standard that helps transit agencies share their routes, schedules and fares in a consistent format. Currently MapQuest's support is limited to six U.S. metro areas.
Flat maps have a hard time communicating elevation changes, but now you can access the data to visualize as you want. Google Maps added two elevation services, bringing you the meters above sea level for any point on earth.
Data marketplace InfoChimps continues its march to API-ify its most useful, sliceable datasets. The latest is a bundle it calls the InfoChimps Geo APIs and it makes available some extremely interesting location data from both public and private sources. The company has created a location data schema to unify sources, which include several place databases, Wikipedia articles and Zillow neighborhood boundaries.