A couple of days ago I noticed that a search on Google resulted in a huge list of domain names from the same country that all linked to http://forum.joomla.org/. To my surprise all those domain kept their own domain name in the URL while showing Joomla forum.
What was the purpose of these "clone domains"?
Why would someone register domain names and present other sites under those names?
Read more: http://community.joomla.org/blogs/community/747-domains-cloned-joomla-forum.html