I also discovered that people have already created a set of WordPress plugins (see:
http://ep-books.ehumanities.nl/ ) to visualise books and other similar publications. However blogs do not fit into a book/chapter model.
However given there is already a schema for publishing blog data and my lh-rdf plugin already exposes most publicly available WordPress blog data as RDF using that format. It was an obvious next step to get the visualiser working with the LH RDF output. I have done so and hopefully you think the output is cool.