: User interfaces to WWW search engines typically present results as ranked lists of documents. Such lists give users little help in understanding document variation: we propose a richer representation of retrieval results in the search interface. Fundamental to us is the notion of document grouping. We use both stylistic genre-based document categorization and statistical content-based clustering, and organize documents along these criteria in a highly interactive visualization front-end to WWW search engines, enabling quick overview and incremental query refinement.