Abstract
The paper describes the capabilities that should be expected of intelligent Web search tools in order to respond properly to user's information retrieval needs. The tools fall generally into three different categories: general purpose search engines, specialized search engines, and personal search tools, which differ in user expectations. Two features, however, seem to be of great importance for each tool: the capability to cluster the retrieved documents and the capability to draw user's attention to next interesting documents (intelligent navigation). A number of clustering and intelligent navigation techniques are overviewed.
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