Posted Jun 24, 2011 1:20 UTC (Fri) by vapier (subscriber, #15768)
Parent article: On keys and users
probably just nitpicking here, but "GPG keys" are simply PGP keys. GPG is merely a GNU implementation of the OpenPGP standard.
also, it can be used for more than just e-mails. it's how many people verify packages (e.g. tarballs) that they release, and how many distros sign their packages (e.g. rpms/debs/etc...).