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Ask RI is a great site that is available to all RI residents.  You can ask a reference question, or even get help from a live tutor.  
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Fact Monster by Information Please. This search engine does a great job finding information just for kids. 
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Sweet Search is made for students.  Only websites which have been evaluated for having credible content are included.  In other words, information that you can trust.
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Ask has a question of the day you might enjoy trying to answer and is a top rated search engine.
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Simple English Wikipedia with easy language for kids.  Great example of a wiki in use also explains how they maintain their site.
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"The Library of Congress serves as the research arm of Congress. It is also the largest library in the world." Great site when you have research to do.
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Wikiquote is a database of quotes from a variety of sources. 
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World Book Kids is based on World Book's Student Discovery Encyclopedia and is loaded with tons of pictures and is easy to read. 
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World Book sources available through AskRI...Digital Libraries, Specialty Sites, and Encylopedias for all ages.  
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Dogpile Searches Yahoo and Google at the same time.
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DuckDuckGo is an alternative to Google.  It's good to check around when you're looking for answers to your research questions.
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Wolfram/Alpha  
Here's a new type of search engine you might want to check out. " Our goal is to build on the achievements of science to provide a single source that can be relied on by everyone for definitive answers to factual queries."
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The American Library Association does a terrific job searching out the best websites just for you.