Andrew Tomkins IBM Almaden Research Center 650 Harry Road San Jose, CA 95120 [email protected] Copyright is held by the author/owner(s). WWW2003, May 20-24, 2003, Budapest, Hungary. ACM 1-58113-680-3/03/0005. Abstract We propose two new tools to address the evolution of hyperlinked corpora. First, we define time graphs to extend the traditional notion of an evolving directed graph, capturing link