Alongside the Google Maps Wikipedia layer and our iOS nearby articles feature (correct?), the Android/iOS app Geoloqi now has a Wikipedia layer. 

More info: http://www.readwriteweb.com/archives/new_wikipedia_layer_on_geoloqi_gives_you_vision_be.php

Geoloqi is pretty cool. It has some cool geo features you can tack on to your apps too: https://developers.geoloqi.com/ in addition to its own feature set. (If anybody wants a contact, I know the founders.)

--
Steven Walling
Community Organizer at Wikimedia Foundation
wikimediafoundation.org