I recently came across Vic's extension package [1] which allows visualisation by using the graphviz/dot package.
Would like to ask, whether this can be enabled on all wikis. I can only support this. Tom
[1] http://www.wickle.com/wikis/index.php/Graphviz_extension [2] http://meta.wikimedia.org/wiki/Category_talk:Mediawiki_Extensions