Can you give me a list of question and answer websites

I'm looking for a long list of question answer websites

http://en.wikipedia.org/wiki/List_of_question-and-answer_websites

There are various questions and answer website but some of them which are really good and are having huge number of question with quality answers related to all categories. Some high quality question and answer sites are mentioned below:-
http://www.question2answer.org
http://www.askpedia.com/
http://www.askmehelpdesk.com/
http://www.blurtit.com/
http://www.ehelp.com/
http://superuser.com/
http://www.theanswerbank.co.uk/
http://answers.yahoo.com/
http://www.mahalo.com/
http://wiki.answers.com/
http://www.fluther.com/
http://www.answerbag.com/
http://www.fixya.com/
http://shapado.com/
http://www.imanswers.com/
http://unasked.com
http://qna.rediff.com
http://askville.amazon.com
http://replyz.com/
http://www.linkedin.com/answers
All these websites are having their own rules and regulation for posting your answer or fetch an answer from that website. Most of these websites needs registration before going for any action.
http://www.seo.india-designers.net/search-engine-optimization.html

Here's a large list:

http://imheadlines.com/blog/big-list-of-question-and-answer-websites-like-yahoo-answers

Check out QUextit at: http://qna.quextitmc.com/qa-service/question-and-answer-service-detailed-description.

http://www.imanswers.com/
http://replyz.com/
http://www.blurtit.com/
http://www.askpedia.com/
http://www.maybenow.com/
http://www.grupthink.com/
http://www.instructables.com
http://www.tezaa.com
http://www.socialanswers.com/
http://www.shopr.com
http://www.ehelp.com/
http://www.ziggs.com
http://www.question2answer.org
http://www.ehelp.com/
http://www.shopr.com
http://www.whyzz.com
http://doctype.com/
http://www.askanddiscuss.com/
http://www.blurtit.com/
http://www.brightstorm.com
http://www.mahalo.com/answers
http://www.refurber.com/questions-and-answers/

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