Most recently I have found whois a good way to validate the age of domains of certain competing companies. This is a very vague thing to look up but it sure is

Most recently I have found whois a good way to validate the age of domains of certain competing companies. This is a very vague thing to look up but it sure is useful, I am sure that it also adds a dimension to trust metrics in search engine and antispam land. I don't want it to die.