The ILGeoNames wrapper, supported by Infinite Loop, allows users to access the GeoNames API using Objective-C. The library's classes provide an alternative to the MKReverseGeocoder class from the iOS SDK. ILGeoNames is available under standard BSD license terms.
InfoChimps, those enterprising primates, have another incredibly interesting dataset to offer up to the world: 60,000+ UFO Sightings. And you thought that they didn’t exist! Now you’re going to have to apologize to the believers that you mocked because this dataset has come to set the record straight. Aliens exist and the evidence is the InfoChimps Datasets API, which makes searchable every documented sighting.
Localscope, the app that:
"lets you see and know your locality like never before," now "enables third party applications to use the Localscope app to search for and discover geo tagged information via the Localscope API."