perpetual scrolling/paging

There’s a site called Cool Hunting that has this “perpetual” scrolling/paging feature. I’m not sure how to describe it. Basically, instead of having to keep clicking to the next page, you just keep scrolling down the page and it automatically loads the “next pages” so that you’re scrolling forever until, presumably, you get to the last page. I guess as a complimentary feature, the menu bar always stays at the top of the page, and the sidebar keeps looping back.

Is there any sort of plugin that’ll do this (the “perpetual scrolling”) for WordPress? It’s a neat trick.