http://www.wickle.com/wikis/index.php/Graphviz_extension#How_to_make_autolin...
Graphviz is well known in the community of "Graph Drawing". It allows "auto-linking" for all nodes in a graph, which do not have an URL tag given by the page editor: because all nodes X, Y, Z ... automatically become links to wiki pages X, Y, Z ... Very useful for mediawikis and wikipedia.