Simply auto loads the next post as you scroll down the page. Also changes the browser URL address and page title from the next post.
Infinite scroll extended to single post pages
EasyScroll adds an endless feed of posts to your site wherever you choose (even custom post types!).
With FlickrFlow you can create pages with an infinite stream of Flickr photos.
Automatically append the next page of posts (via AJAX) to your page when a user scrolls to the bottom.
Infinite scroll for your site with “paginator” and an easy way to go to the top/botttom.