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.
Google has announced the launch of Google Maps Android API v2 featuring interactive, vector-based maps that support 2D and 3D views. Developers can use the new version of the Google Maps Android API to create feature-rich, beautifully designed Android apps.