There are approximately zillions of specialized search engines out there, as can be seen at Search Engine Guide. The list below is a selective subset of these, chosen because they might help you find materials useful as resources in a WebQuest. All of these links lead to sites that contain specific information that may not turn up when you do a general search of the Web using Altavista, Yahoo, and other search engines and directories. For a more comprehensive list, you might also want to check the Invisible-Web site.
"Help your students become better searchers
Web search can be a remarkable tool for students, and a bit of instruction in how to search for academic sources will help your students become critical thinkers and independent learners.
With the materials on this site, you can help your students become skilled searchers- whether they're just starting out with search, or ready for more advanced training."
Ever wish you could create a personalized, customized search engine that searches only across sites that you specify and displays results that you know will be right for you or your students?
Now you can explore the web in an entirely new way by beginning your Google search with an image. Learn more about images on the web and your own photos.
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research.