I posted an updated tech demo of RhNav - Rhizome Navigation visualizing user behavior of this blog. The graph is now centered around the page where most time is spent. Noise created by search engine robots is filtered which should clear things up quite a
S. Lohmann, P. Heim, T. Stegemann, and J. Ziegler. Proceedings of the 14th International Conference on Intelligent User Interfaces (IUI 2010), page 421-422. New York, NY, USA, ACM, (2010)