The search for relevant information on the Web is a personalized discovery process. In this process each person will aggregate new information to the border of what he or she already knows. Finding relevant information is also related to the user history, being driven by his or her intentional selection of documents to access. This paper presents a collaborative navigation tool, called z9, whose main purpose is to selectively transfer anonymous navigation information among a group of users, based on identified user similarities. These similarities are the starting point for the presentation of exploration paths that potentially lead to relevant information.