The term you are looking for is a cyber squatter. Or maybe you are talking about a Registrar. If you are looking to buy one, go-daddy and yahoo are the cheaper domain name registrars on the web. InterNIC.net has a full list of authorized registrars and is actually the centralized registrar for all domain names and the standards of the domain naming convention. I don't know exactly. But I heard something about e-governors. They are people who are to decide whom to sell domains. The middling companies just buy the rights to sell domains and then sell them. I think you can register domain after wasting a lot of bucks. Though I can't tell you the actual procedure.