The video is a screencast of RhNav - Rhizome Navigation visualizing the Blogosphere as a 3D graph using the technorati API. www.rafelsberger.at is used as a starting point.
M. Haouach, G. Venturini, and C. Guinot. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (July 2009)
S. Kuznetsov, and S. Obiedkov. Principles of Data Mining and Knowledge Discovery, page 289--300. Berlin, Heidelberg, Springer Berlin Heidelberg, (2001)