"Whitelabel" module

A number of solutions are springing up for deploying site configuration (spaces, patterns, etc). And solutions are starting to spring up around deployment of custom sites as well - the Aegir project and the Domains module both provide tools for pushing out multiple sites on a single infrastructure.

No system allows users of a central site (say, www.foo.com) to create a new multisite instance with a given profile underneath the same domain. A system that allows users of a central site to "clone" a prefabricated site at a subdomain would make a world of Drupal-based sites much easier to implement.