We extend the notion of bookmark management by introducing the functionalities of hypermedia databases. Power-Bookmarks is a Web information organization, sharing, and management tool, which parses metadata from bookmarked URLs and uses it to index and classify the URLs. PowerBookmarks supports advanced query, classification, and navigation functionalities on collections of bookmarks. PowerBookmarks monitors and utilizes users' access patterns to provide many useful personalized services, such as automated URL bookmarking, document refreshing, and bookmark expiration. It also allows users to specify their preference in bookmark management, such as ranking schemes and classification tree structures. Subscription services for new or updated documents of users' interests are also supported.