wiseGEEK
- A growing archive of questions and answers, covering twenty different categories. Users can ask questions and comment on articles.
- http://www.wisegeek.com/

Videojug
- A large collection of professional and amateur video tutorials, how-to videos and advice. Users may submit questions as well as video answers.
- http://www.videojug.com

QandAs.com
- A community of experts and specialists covering dozens of topics. Must do free registration to ask a question.
- http://www.QandAs.com

IQgeeks.com
- Question and answer services as well as a forum for discussions of random, weird and interesting facts.
- http://www.iqgeeks.com

Blurt It!
- Users can ask questions, answer questions, and collect points for questions answered.
- http://www.blurtit.com/

JustAnswer
- Auto mechanics, doctors, accountants and other experts answer user-submitted questions for an agreed upon fee.
- http://www.justanswer.com/

Askville by Amazon
- User-generated questions and answers, also with discussions and expert user profiles.
- http://askville.amazon.com/askville/Index.do#answers

I Recognise That
- I Recognise That is a place where people can ask or answer questions about anything and everything. Someone that asks a question can also upload a photo to help illustrate that question. Questions are answered by other users.
- http://www.irecognisethat.com

Google Answers
- Now retired service where live researchers used to answer your questions on any topic for a fee. Existing answers can however still be browsed or searched for free.
- http://answers.google.com/

European Experts Exchange
- Multilingual experts offer their feedback on common open-source applications, including PHP and MySQL.
- http://www.europeanexperts.org/

Nadlan Info
- Panel of construction experts responds to questions about civil engineering, architecture, interior design, and plumbing.
- http://www.nadlaninfo.com/

Wondir
- Ask or answer questions on all topics. Responders are eligible for tips, prizes, and published ratings.
- http://www.wondir.com/

UKExpert
- A discussion site with a large team of expert moderators and members making up its community. It also has live news, polls, and a photographs section.
- http://www.ukexpert.co.uk/

Globe Alive
- Searchable database of experts standing by to help you.
- http://www.globealive.com/

CIO Magazine's Ask the Expert Series
- Pose questions to industry leaders. Specific questions will be selected to be answered by each month's expert. Responses will appear during the last two weeks of each month.
- http://www2.cio.com/ask/expert/

Yahoo Group: Science Help
- Ask questions about biology, physics and chemistry.
- http://groups.yahoo.com/group/sciencehelp/

Able2Know - Ask an Expert
- Ask an expert at this knowledge exchange where experts answer one's questions. Features discussions on diverse topics.
- http://www.able2know.com/

AskAnOwner.com
- The AskAnOwner community gives consumers the opportunity to ask direct questions to users of products and services. They can expect honest and direct answers to there questions.
- http://www.askanowner.com/

Ask A Linguist
- Post a question involving language to a panel of linguists; browse and search past answers.
- http://www.linguistlist.org/ask-ling/

Since You Ask
- Ask any question, researchers will find the answer and post it on the page.
- http://home.flash.net/~goodkids/sya.html

Ask Me Help Desk
- Become an expert or ask an advisor about subjects such as homework help or interview questions at this question-and-answer community.
- http://www.askmehelpdesk.com/

ask BAR
- Ask questions and get free expert answers from real people in almost any topic.
- http://www.askbar.com/

Ask an Expert Sources
- Index of ask an expert sites.
- http://www.cln.org/int_expert.html

Ask a Chef
- Questions answered about cooking from volunteer expert chefs.
- http://www.askachef.com/

Ask The Inventors
- Free help for first-time inventors about how to go from idea to patenting, marketing and licensing.
- http://www.asktheinventors.com/

AllExperts.com
- Volunteer experts answer all your questions.
- http://www.allexperts.com/

The Answerbank.co.uk
- United Kingdom based question and answer site with weather, crosswords, quizzes and horoscopes.
- http://www.theanswerbank.co.uk/