I just posted a (3:20) screencast that demonstrates the functionality of the RDFIO extension [0] I'm working on as GSoC project [1].
Hope it gives an idea of the project for those of you who don't have time to install and test it out yourselves ... and spurs feedback! :)
// Samuel
[0] http://www.mediawiki.org/wiki/Extension:RDFIO [1] http://www.mediawiki.org/wiki/User:SHL/GSoC2010