lessonplanet.com
Lessonplanet searches for or browse information on education topics.
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answers.com
Answers is a question-answer engine and community that lets people search for answers. You can directly ask questions and the sites answers them accurately.
LINK: http://www.answers.com/
ask.com
Ask is a question-answer community cum search engine that allows searching for web, images, videos and news. You can also ask questions for getting quick answers.
LINK: http://www.ask.com/
quora.com
Quora is a question-and-answer site where questions are asked, answered, edited and organized by it’s community of users.
LINK: https://www.quora.com/
ehow.com
eHow is an online how-to guide. It has got a large number of articles and 170,000 videos. eHow offering step-by-step instructions. Articles and videos are created by freelancers and cover a wide variety of topics organized into a hierarchy of categories.
LINK: http://www.ehow.com/