Wikipedia released updates to both its Android and iOS apps earlier this week. In the process they decided, as others have, to ditch Google Maps in favour of OpenStreetMap.
Apple launched iPhoto for iPad yesterday, complete with the usual integrated mapping features. However, unlike its desktop counterpart, iPhoto for iOS uses OpenStreetMap (OSM) data, with Apple apparently deciding to ditch Google Maps on this product.
Foursquare has ditched Google Maps in favour of MapBox using OpenStreetMap data, citing Google Maps pricing as a primary concern. Google Maps began charging some of its biggest API users, like foursquare, last October.