Agree!
Well if you could mix it with the "semantic" and rdf syndication It would be a killer app. :-)
Here is a nice new J component too "
RDF Syndication component".
http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,5801/Itemid,35/
Joomla! RDF Syndication component is used for exposing RDF data from Joomla! content,user,section,category and integrating with other Joomla! sites,Semantic Web Engine, other RDF data sources using RDF format.
* Browse Joomla! content in factet browser
* Syndicate Joomla! content from mutiple Joomla! sites then render then in facet browser
* Search relevant posts of a Joomla! user (using his email as searching keyword) in a Semantic Web Search Engine (Sindice.com)
* Integrate user's personal information from remote RDF-based resources (FOAF file,vcard,html pages with microformat,etc) to user's profile through a web remixing server (Semantic Web Pipes).