It is interesting to see how namespaces evolve in the Internet…. I find it especially interesting the move in importance from Open namespaces to the Closed ones, controlled by specific companies.
In early nineties when WWW was just getting on its feet everything was about the Domain Name namespace. These were issued on first come first serve basics and you would not need any approval just desire to pay yearly maintenance fee. This free system had its flaw. Domains could be registered in thousands (or even tens of thousands) for purposes of being resold when someone is looking for well sounding name or pure extortion when names matching other company name or product name are created. As internet Evolved it became harder and harder to get decent names. Somewhere in 1997 we got “virus.ru” domain name which was available – note a word which you could find in a dictionary. In 1999 we had “spylog.com” registered which is decent sounding word combination. In 2006 we took a while to find the name for the company “Percona” which also would be available in .com TLD Now with over 100million of domains registered in .com TLD more and more people have to buy domain names from third party for anything what sounds and types reasonably.
With all its problems and limitations the benefit of it is you essentially “own” the domain name and the decision of court of law is required to take it away from you, so it is rather safe to be working on building value connected to domain name.