The Adform Android SDK by rprunskas allows to implement advertising features into mobile applications. Basic antegrations include inline ad, overlay ad, intersitial ad, adhesion ad, and video ad. Resources include advanced integrations and release notes.
When Google first launched its location-sharing service, Latitude, developers were left wondering how to access their users' data. Now, over a year later, we finally have a Latitude API. But we also have a number of other similar services that have better traction and are arguably more fully featured.