This is a cool idea -- giving people a way to grow their site from a list of links to something more complex makes a lot of sense. That said, and I know criticisms like this are a bit of a cliché at this point on HN, but why does a static list of links need to download 18MB of JavaScript, show a progress bar, and modify the scrolling behavior of the page? I assume at some point in the future this JS will be useful for adding more advanced features to people's sites, but it might be worth paring it down to just what's actually necessary for the kind of page it is.