TouchGraph provides a hands-on way to visualize networks of interrelated information. Networks are rendered as interactive graphs, which lend themselves to a variety of transformations. By engaging their visual image, a user is able to navigate through large networks, and to explore different ways of arranging the network's components on screen.
The touchgraph wiki browser is a nice application that can be used to view a graphical representation of the Tiki wiki.
Please see a TouchGraph WikiBrowser screenshot of tikiwiki.org