I'm surprised they didn't mention it in the article but BBC just released a great doc about Randi. It covers all the same stuff in this article but goes into a lot more detail, showing many of his confrontations with Geller, Popoff, etc.

Stream here: http://www.bbc.co.uk/iplayer/episode/b04ndsb3/storyville-201... (UK only but the tech savvy reader may be able to find it elsewhere)