Maglio, P. P., Barrett, R., Campbell, C. S., and Selker, T. (2000). Suitor: an attentive information system. In IUI ’00: Proceedings of the 5th international conference on Intelligent user interfaces, pages 169–176, New York, NY, USA. ACM Press. [pdf]
This paper describes Simple User Interests Tracker, an attentive system that pays attention to what the user is looking at and through probabilistic models infers what his/her intrests might be. Then this information is used to create a peripherial awareness around the interesting topic.