Here is a rundown of servcies where a consultant or expert might sell their services online as a freelance.
BitWine – Uses skype to connect specilaits advisors and consultants (like you) to paying customers
Elance.com – Outsourcing to Freelance Programmers, Web & Logo Designers, Writers, Illustrators and Business Consultants.
iFreelance – Sell your professional services to needy buyers
Skype Prime (new) – Essentially paid Skype-to-Skype voice and video calls. You can charge other people for calling you either a one-off fee or by the minute. Conversely, if you are the caller, you can call experts who charge for their services, and you can then pay the fee and access the expertise that the other call party provides.
Guru.com – The granddaddy of them all, billed as “the world’s largest online marketplace for freelance talent.”