The user interface is another interesting area for future research. The amount of user interaction required can be further reduced by use of more intelligent interfaces. ``Smart badges'' have been used for user modeling [35] to detect the physical location of the user. A possible application to our filtering system is to automatically assume positive feedback if the user spends a long time in front of the computer when the document is displayed. This would lessen the burden of interaction for the user.
The interface could also take advantage of multiple media. For example, some users would like to read textual news, hear it if they're driving, view it if it involves video and so on. An interesting problem is to design an intelligent agent that can communicate using multiple media and can offer the user seamless navigation across media.