Domaining can be a very lucrative business. Bill Gates once famously stated that domain name would be the most lucrative commodity in the history of mankind. There are domainers that have multimillion-dollar portfolios to support this theory as well, but the question is where to sell them.
DNForum.com
There are over 85,000 domain resellers on DNForum--one of the oldest and largest domain-name forums--who are actively buying, selling and discussing domain names. It is one of the best places to get started if you don't know what you are doing and is very welcoming and newbie-friendly. There are thousands of posts in dozens of categories to help educate you about the ins and outs of the domaining business. As of 2010, it is free to register at the site, which will allow you to read and make posts. However, if you wish to buy or sell domains, you have to sign up for a premium package. A lifetime membership costs $75, while an annual membership is $40.
Sedo
Sedo is one of the most well-known brokerage and services for domains. Although you won't get to learn about the business here the way that you do at DNForum, Sedo is a high-trafficked site that will get a lot of exposure for the domains you wish to sell. It is free for sellers to list here, but Sedo takes 10 percent of the price when a domain name is sold. Sedo also offers extra services such as domain-name appraisal, which costs $25 to $35.
NamePros
This forum has over 2 million posts and dozens of topics. In addition to being able to buy and sell domains here, you can also get your domains appraised. There is also lots of information on how to develop your domains, which will help you to sell them for a much better price. As of 2010, the site is free to sign up for; post your domains for sale and get appraisals for free, as well. The NamePros site makes money by selling its own services.