This is beautiful. It would be nice to be able to collapse pages together or somehow view cycles. On sites where users tend to have long sessions the graph of site traversal has cycles which may themselves be as interesting as how users exit a given page. For example if you have a group of desirable actions (say you have a site with shopping and user-user messaging) and you want to roll up the exits (collapse the above pages together and find out how much in users are falling out of those pages into help).