I recently stumbled across idnx.com ( the internationa ldomain name index ) . Idnx is an incredible resource for those who works with domain names or for companies looking to either invest in a domain for their business or just for the investment value of domain names.
The idnx.com graph is calculated based on more than 225 000 domain sales and compared to the nasdaq numbers. It is really interesting to see the numbers since 2006 when they started measuring the market. The domain name index is actaully showing that the domain market has been more stable than nasdaq for the past nine years!
That stability along with new services like financing with domains as the only security is one of many things that prooves that the domain name value is here to stay.