Together with Antonio's group we looked at new forms of interaction beyond the desktop. The journal paper Tangible, Embedded, and Reality-Based Interaction  gives overview and examples of recent trends in human computer interaction and is a good starting point to learn about these topics.
Abstract: Tangible, embedded, and reality-based interaction are among novel concepts of interaction design that will change our usage of computers and be part of our daily life in coming years. In this article, we present an overview of the research area of tangible, embedded, and reality-based interaction as an area of media informatics. Potentials and challenges are demonstrated with four selected case studies from our research work.
 Tanja Döring, Antonio Krüger, Albrecht Schmidt, Johannes Schöning: Tangible, Embedded, and Reality-Based Interaction. it - Information Technology 51 (2009) 6 , S. 319-324. (pdf)