His visualizations are awful. They are the sort of infoporn so beloved of newspapers and magazines that fail to get over the important underlying information. I criticized one in detail on my blog: http://www.jgc.org/blog/2009/11/how-to-fail-at-data-visualiz...
Seems like the author would really enjoy reading some of E. Tufte's works. "The Cognitive Style of Powerpoint" is immensely amusing, and his other books are inspiring and breathtakingly clear. The kind of thing you read to get ideas.