Hello I've modified the TouchGraph Applet for MediaWiki Visualizations. There are two menus added to select the visualization parameters: 1) types of links to show and 2) size of nodes (in relation to counter, size or modifications for each article).
The semantic-Wiki-content is updated daly by a cron-job. You can download the hole package and install it on your own MediaWiki.
The running visualization is here: http://tecfax.unige.ch/portails/mediawiki/index.php/Special:WikiViz
The download you will find here: http://tecfax.unige.ch/portails/mediawiki/index.php/Special:SemanticWiki
Comments and further developpement welcome!
Urs Richle