I missed this when it was reported at the end of last month. Michael Moore's team had interviewed and filmed Berg during the filming of "Fahrenheit 9/11".
See http://xymphora.blogspot.com/2004/05/cutting-room-floor.html which ends with this quote:
Berg seemed to live quite a life of adventure with very marginal means of support. You have to wonder whether he had a secret sponsor. His propensity for 'running into' certain people is beginning to look like a pattern.
See also news stories for instance here:
http://news.bbc.co.uk/2/hi/americas/3757665.stm
http://www.cnn.com/2004/US/Northeast/05/29/moore.berg.ap/
http://truth-media.org/modules.php?name=News&file=article&sid=156