TopReference.com offer reference website links to browse for education, libraries, dictionaries, colleges, universities, k-12, language schools, book and magazines.

For a Fee

Listings
Get answers to questions on many subjects. Questioner posts question, views bids to answer, and selects best proposal.
http://www.askanything.com/
Aims to put people who are seeking information in direct contact with other people who have the answers.
http://www.bumperbrain.com/
For verbally abusive people and the codependents who love them.
http://www.drirene.com/
Online marketplace facilitating the exchange of money for fast solutions. Anyone can post a question and anyone can answer.
http://www.helpshare.com/
An online information market that anonymously matches seekers of information with providers of information. Experts get paid by charging fees for their answers.
http://infomarkets.com/
Experts in industry, technology, science, materials, and business provide telephone, e-mail and project consulting.
http://www.intota.com/
Gives users direct access to experts in a wide range of categories. Offers full sound and video facilities in addition to e-mail and chat.
http://www.kasamba.com/
Service which offers telephone conversations to ask for advice.
http://www.keen.com/
Offers inspiration, marketing ideas, research, and negotiating.
http://www.yourjewishfairygodmother.com/