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Able2Know is a free knowledge exchange. This is a moderated site that counts on the expertise of volunteers to answer any questions you have.
http://www.able2know.com/
Covers a variety of topics including music, sports, health, love and romance, and more.
http://www.allexperts.com/
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/
Free help for first-time inventors about how to go from idea to patenting, marketing and licensing.
http://www.asktheinventors.com
Thousands of experts answer technical questions, which are posted on site by subject area.
http://www.experts-exchange.com/
News, expert articles on competitive intelligence and research and an enormous research web guide - thousands of the most valuable research sites, hand picked.
http://www.passingnotes.com
Physics homework help, tutorials, solved problem sets are provided to university, college, and secondary school students.
http://www.physics247.com
Collaborative reference service from the Library of Congress and OCLC.
http://www.questionpoint.org/
United Kingdom based question and answer site with weather, crosswords, quizzes and horoscopes.
http://www.theanswerbank.co.uk/