http://answers.com
Answers - The Most Trusted Place for Answering Life's Questions, Q&A wiki
This free reference tool from Answers.com can look up quick answers in a range of authoritative sources, while you're working.
Questions and answers in a shared, wiki format.

http://ask.com
Ask - What's Your Question
Offers search for web sites, images, news, blogs, video, maps and directions, local search and shopping.

http://answers.yahoo.com
Yahoo! Answers
Ask questions and get answers from other people in the community.

http://askville.amazon.com
Askville by Amazon - Ask questions, Find answers
Do you need help or need to ask a question? Can't find it on Search? Askville is a community where people love helping others.

http://theanswerbank.co.uk
The AnswerBank
Post questions and answers or discuss topics of interest.

http://justanswer.com
Ask Experts & Get Answers to Your Questions - ASAP
Auto mechanics, doctors, accountants and other experts answer user-submitted questions for an agreed upon fee.

http://blurtit.com
BlurTit - Ask Questions, Get Free Answers
Users can ask questions, answer questions, and collect points for questions answered.

http://answers.google.com
Google Answers
New questions are no longer accepted though the answer archive can still be browsed and searched.

http://aolanswers.com
AOL Answers (Former Yedda)Ask questions and share, explore and discover knowledge.

http://ehow.com
eHow - How to Videos, Articles & More - Discover the expert in you
Provides concise how-to articles over a broad range of topics.

http://ask.metafilter.com
MetaFilter Community Weblog
Questions and answers by the MetaFilter community.

http://qna.live.com
Microsoft QnA
Get answers and share expertise with the others in the community.

http://allexperts.com
AllExperts Questions & Answers
A directory of subjects with volunteer experts to answer posted questions.

http://chacha.com
Questions & Answers by ChaCha
This search engine is a fusion of computer technology and human intelligence. Live human guides are available to provide more info.

http://simplyexplained.com
Questions & Answers by experts in their fields - ask an expert
A website set up to answer all your frustrating questions. Experts in their fields may register on the site.

http://questionville.com
QuestionVille - Ask Something
Questionville is a social forum site that lets users submit questions and answers. Best answers are voted to the top of each question.

http://wikihow.com
How To Do Anything
A collaborative writing project to build the world's largest how-to manual.