User interest modeling attempts to represent user interests in a form that can be used to improve system support when users are searching for, selecting from, and browsing documents or other resources. Work on recognizing user interests based on their prior activities, such as their browsing behavior, is a common approach to implicit user interest modeling. The work presented expands on this approach by aggregating activity across multiple end-user applications. This talk presents the evolution of the Interest Profile Manager, a local application that collects activity data and acts as a service to those applications seeking to better support information access.