How to move every node to its own subdomain with Drupal?
A couple years later... I have a similar requirement.

The Subdomain Field module works well for me. https://drupal.org/project/subdomain_field

Has clear installation instructions: edit your settings.php, update your virtual host, add a wildcard DNS record. Then simply install the module and add a "Subdomain Field" field type to any content types that you want.

Now when I edit /node/2 and change the subdomain, I have subdomain.example.com displaying the contents of node 2. Perfect!

Note that it requires the Entity API module, but that is currently not listed as a "requirement"