http://www.quora.com/Linux/How-many-lines-of-code-if-any-from-Linux-1-0-are-still-in-the-modern-Linux-kernel-and-what-is-it There are more than a few lines of code from Linux 1.0 and even 0.01 in the modern kernel.
http://www.ibiblio.org/oswg/oswg-nightly/oswg/en_US.ISO_8859-1/articles/alan-cox/mac/mac.html Alan Cox on porting Linux to 68k Macintoshes.
http://mjg59.livejournal.com/136274.html A rant on the desire to create "lightweight" open source software replacements. I'm linking this in particular because "To a first approximation, when someone says "Lightweight" what they mean is 'I don't understand the problems that the alternative solves'." is an excellent quote and summary of the issue.
http://codemonkey.org.uk/2011/06/01/red-star-kernel/ North Korea has released its own Linux distribution. I'd love to see the source.
http://www.mnxsolutions.com/security/two-factor-ssh-with-google-authenticator.html Google's new two-factor authentication can be hooked into PAM.