http://en.wikipedia.org/wiki/HTTP_404

http://en.wikipedia.org/wiki/404

http://www.plinko.net/404/

http://www.sendcoffee.com/minorsage/404error.html

http://www.smashingmagazine.com/2009/01/29/404-error-pages-one-more-time/

http://www.cnet.com/the-404-podcast/

http://www.404lounge.net/

http://www.flight404.com/

http://www.mamselle.ca/error.html

http://www.cddc.vt.edu/host/404/