SemanticWebDotOrg is the new name for OntoWorld http://www.semanticweb.org/wiki/Main_Page
This is semanticweb.org, the wiki for the Semantic Web community. Our mission is to provide a knowledge repository and platform for advertising events, spreading news, and announcing new developments. It is a wiki: everybody can quickly edit its content, even without logging in. So look around and participate!
It is still a site for links about SemanticMediaWiki and the SemanticWeb.
It has a copy which can be used to try it out which is at http://sandbox.semantic-mediawiki.org/wiki/Main_Page