Here is the link for Janet Cardiff and her husband Georges Bures Miller. If you look at the site and listen to some of the audio, I think you will find it interesting. It may give you some ideas for your own projects.
http://www.cardiffmiller.com/
Neighborhood Narratives invites students to examine the city as a virtual and mixed reality space and investigates the complex means by which cell phones, GPS, mobile recording devices and social network games effect their knowledge of and relation to lived space.