Here is a sampling of how mobile devices are used in education.
Google Earth for iPhone
Mobile MAAP--Columbia University's Mapping the African American Past (MAAP)
Panoramio--an app for Android mobiles that brings up a map of the user's current location and shows pictures of that area
ZooZBeat--application for iPhone using a gesture-based musical studio
Taken from The Horizon Report: 2009 K-12 Edition, p.18.