Technology is an immense tool that can transform the way students learn. One of my favourite quotes which demonstrates this comes from Steve Jobs: "What a computer is to me is it's the most remarkable tool that we've ever come up with, and it's the equivalent of a bicycle for our minds."
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.