Here is a sampling of how mobile devices are used in education.
Google Earth for iPhone
http://googleblog.blogspot.com/2008/10/introducing-google-earth-for-iphone.html
Mobile MAAP--Columbia University's Mapping the African American Past (MAAP)
http://maap.columbia.edu
Panoramio--an app for Android mobiles that brings up a map of the user's current location and shows pictures of that area
http://android-developers.blogspot.com/2008/09/panoramio.html
ZooZBeat--application for iPhone using a gesture-based musical studio
http://zoozmobile.com/zoozbeat.htm
Taken from The Horizon Report: 2009 K-12 Edition, p.18.