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Site that allows the user to enter any word and a variety of links will be brought up that relate to that word.

Neat search engine. You put in any word and it goes out to the web and grabs multiple links that connect to that work in some way.

Site for students with sites approved by educators.

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Quintura for Kids is a search engine for kids that acts a bit like a tag cloud in that results can be embedded in a site.

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Middlespot is an innovative web site for social bookmarking that allows users to collect sites in a visual way. This would be a great tool for teachers to organize content appropriate web sites and then share them with their students.

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Article on 10 steps to a better web research.