This is the authors' final draft of the paper published as International Journal of Human-Computer Studies, 2011, 69(1-2), pp.1-2. The paper is an editorial for a special issue.
The original published version can be found on the publisher's website at: http://www.sciencedirect.com/science/article/pii/S107158191000128X ; DOI: 10.1016/j.ijhcs.2010.11.001