A look at MIT’s Media Labs, Henry Lieberman – “Letizia” project.
“Letizia is a user interface agent that assists a user browsing the World Wide Web. As the user operates a conventional Web browser such as Netscape, the agent tracks user behavior and attempts to anticipate items of interest by doing concurrent, autonomous exploration of links from the user’s current position. The agent automates a browsing strategy consisting of a best-first search augmented by heuristics inferring user interest from browsing behavior.”
http://lieber.www.media.mit.edu/people/lieber/Lieberary/Letizia/Letizia.html