A few months ago I posted a writeup about displaying a Gameboy video signal on an oscilloscope (http://www.flashingleds.wordpress.com). It did the rounds for a few days (kotaku, HN, hackaday, slashdot etc.), and I was slightly surprised at which sites generated the biggest numbers. Reddit was at the top by far, something like 25k in 24 hours without having even made their front page, followed by slashdot (7k) then HN (3k). For a site that usually ambles along at ~80 hits a day it was pretty crazy.