Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess
User Experience and Experience Design !
Sweeney, Breen and Adams, Anne (2009): Virtual world users evaluated according to environment design, task based and affective attention measures. In: Proceedings of the HCI09 Conference on People and Computers XXIII 2009. pp. 381-387. http://doi.acm.org/10.1145/1671011.1671060