Nice link from Pierre, to this lab in Sweden that is working on Mobile applications a location based services. It is a collaboration between the Swedish Institute of Computer Sciences and Viktoria Instituet:
We aim to develop innovative mobile services and the corresponding supporting technology and platforms. Our research method involves moving beyond the creation of individual services and form general design approaches, methods, and middleware . Initially, we focus on five such general design approaches: how to exploit affect in mobile settings, how to create social mobile services, how to exploit mobility in entertainment services, how to improve mobile services through multimodal interfaces, and how to support collaboration through articulation of mobile activities.