How important is the extension on the end of a Domain Name? Say a dot com vs a dot biz name? While dot com names are King, I think the extenstions of, .us, .info, .biz, names are becoming more and more accepted. I believe in todays age, you Must have a Web presence in this business. With all the good .com names being taken, and thousands of great names available in .us, .info, .biz, extensions, I think that makes them look like a good alternative.