At Leeds Met we have been working on geo-centric interfaces since not so long. Last summer (August 2007) we have developed a small software tool for adding EXIF location data into a JPG image ("geo-tagging"). There are a few issues with this software, and it is due for some maintenance.
Further, we have set up a web site during the 2008 Carnegie Great Student Run here in Leeds to track the position of a few runners live through their mobile phones. Based on this project, we are extending the functionality to improve performance and enable the development of more complex applications.