The document discusses various visual and clustering search engines that can be used as tools for concept generation, mind mapping, outlining and more. It provides examples of using different search engines like Touchgraph, KillerInfo, Clusty, Exalead, Vivisimo to search for and visualize concepts related to the topic of "bioethics". It also suggests possible applications of these tools such as concept clarification, overcoming writer's block, helping concrete thinkers work with abstract concepts, comparing concepts across tools, and evaluating recommended concepts.