Artificial gravity as an aid to navigation of graphs

Hi folks. I and some colleagues and students have been doing research, for some years, on "gravitational flavorings of graphs." We're interested in the extent to which "artificial gravity" can aid in the navigation and design of web sites. We're looking for participants to help us investigate these graph theoretic constructs as human factors. Please participate at
http://cs.sru.edu/~gravity/botzer/gravity/splashPage.html

Relevance to SVG? The graphs are designed using Grapher<http://srufaculty.sru.edu/david.dailey/grapher/> a web app that allows creation and editing graphs (in the graph theoretic sense rather than the MBA sense) and then conversion of said graphs into web sites. The resultant structure's hyperlink topology then matches that of the graph as designed.
cheers
David