Interesting article. It's got me following links like crazy and reading up on a bunch of things I've always had a passing interest in (cryptography) but never bothered to really look into.
I've finally looked up how to use PGP with email and got it all set up, but since I know absolutely nobody else who uses PGP for their email I can't even try it out.
I doubt anyone I know personally and could truly verify their identity (that they are who they say they are) could be bothered to go through the effort to set it up for themselves. They'd probably just look at me strangely and wonder what all the fuss was about.