The first video (the one showing the interview interrupted by the security guard) was posted by Mark Frauenfelder on Monday: http://www.boingboing.net/2008/06/02/security-interrupts.html

There was an article about Seth Roberts in the New York Times magazine, back in 2005. It's at http://www.nytimes.com/2005/09/11/magazine/11FREAK.html

He also guest-blogged on the nytimes freakonomics blog for a while.

#4: you're not crazy - there have been at least two previous posts on the work of Christopher Conte, though they all link to different articles

http://www.boingboing.net/2008/01/27/steampunk-bronzes-of.html

http://www.boingboing.net/2007/04/11/cyberpunk-bronzes.html