Search Credible is a search service that allows you to access 26 different search engines from one location. Included in the list of search engines Search Credible searches are Wolfram Alpha, EBSCO, ERIC, and the usual suspects such as Google, Bing, and Yahoo. To use Search Credible just enter your search term(s) then click on the search engine of your choice.
Applications for Education
Search Credible's utility for teachers is that instead of having to tell students to go to multiple individual search engines it gives them one place to direct their students to. Teachers could use Search Credible as the basis for a comparison exercise in which students evaluate and compare different sources of information on the same topic.
Here are some related items that may be of interest to you:
Beyond Google - Improve Your Search Results
Mashpedia - The Real-time Encyclopedia
Wolfram Alpha for Educators - Free Lesson Plans