I wrote a paper with Andreas Lorenz and Andreas Zimmermann about architectures for mobile and contextualized learning for the ICALT 2006 conference.
Abstract: The paper introduces the background and motivation for contextualized learning experiences and a short overview of recent research work on valuable mobile applications for learning. Based on a background of situated cognition and situated learning authentic learning experiences can be supported by a variety of context parameters. The paper illustrates a general architecture for contextualized applications and identifies important issues for contextualizing learning experiences and learning content.