Enkin from Enkin on Vimeo.
With the latest mobile devices including GPS, Digital Compasses and Accelerometers as standard augmented reality in the field is becoming the current application to develop. The movie above my Enkin details data tagging in urban areas running on Android (the open source mobile platform from Google).
The concept is transferable to the field of landscape visualization with geographic features tagged and viewable by simply panning the device around the landscape. Past and future landscapes can be draped over the views opening up applications as wide apart of historic visualizations to the visual and audio impact of future windfarms.
See http://www.enkin.net/ for more info.