This page is rather out of date; a new one is being constructed, but you know how long construction takes...
My primary research areas are Computer-Supported Cooperative Work, and Human-Computer Interaction. Within those areas, my research interests are fairly broad, but tend to focus around a single theme: understanding how the experience of interactive technology allows people to create and share new forms of practice.
When I say the experience of technology, I mean not just its usability, or other engineering-oriented metrics of effectiveness; instead, I mean the ways in which people experience the technology as useful or meaningful. Similarly, when I talk about practice, I mean ways of acting with and through technology; not just how people use computers, but how they adapt and adopt them, incorporating them into their lives and their work.
So, this approach combines theories of human cognition, foundational understandings of computation, theories of social interaction, new design techniques, and novel forms of interactive technology. I coined the term embodied interaction to describe an approach to interaction that is centered on practical, embodied experience. My book, "Where the Action Is," describes this approach and its background in more detail.
I and my students tackle these problems both by studing how people encounter and experience technology in the real world (generally through ethnographic fieldwork), by building and deploying prototype or experimental technologies, and by building theoretical models that describe aspects of the relationship between practice and technology. A high-level overview is availble in a white paper entitled "The Experience of Computation."
For more details, see the pages describing some specific projects: