This official Open Street Map library can read, export, and handle OpenStreetMap data in Ruby language. This library can export Google Earth files, GPS exchange format, and comma separated values. The API supports information of updates and geometries.
MapQuest's recent entree into mobile developer tools is an interesting one. Choosing Android over iPhone means going toe to toe with Google, a familiar competitor to MapQuest on the mapping front. Mapping is logically MapQuest's turf. The company was helping people find directions online before Larry and Sergey were even in graduate school, let alone leaving to found Google. Of course, another way of looking at it is that Android is in line with MapQuest's latest push to open up mapping data.