The Occasional Occurence

So I was just reading this techie blog, and when I was mousing over a link about to click on it, all of a sudden this "mini-preview" of the page I was about to click appeared. It didn't really do anything beneficial - just showed this little thumbnail of the page that I was thinking about clicking, and got in my way.

Is this someone's way of improving hyper links or something? Seems like they have been working pretty well for a few years.

cw

ps - I must be in a crotchety mood.