The Google Places iOS library by Lukas Kukacka uses a simple block interface to interact with the features of the API that include mapping, localization, and reference. This project offers place search, with nearby search and text search. It also provides places details, with a more detailed information about a specific location. Available as CocoaPods.
Take a look at MapCruncher. A very interesting new map mashup technique from the folks at Microsoft Research. It basically allows you to overlay any digital map image on top of a normal, zoomable Virtual Earth map.
Mapbox continues to enhance mapping features designed for gaming in the AR space with new features to its Maps Unity SDK. Specifically, Mapbox has added new features to points of interest and augmented reality to the latest version of the SDK. Mapbox will demonstrate next week at its Locate event.