I find it a bit odd that they spend so much time hovering over the first link. It's cool to see prefetching at work like that, but it's also really odd to see people hovering over the link they want for so long.
the case for the hovering of a link just triggers the request earlier giving the browser some seconds of advantage, there's no need to keep hovering until the request ends ;)
Nice article. What is up with the nightmarish header image, though?