Loading content as the user scrolls down

Question

I am building a blog type page, and I want to load items into the page as the user scrolls down, much like Google Reader, or Soup.io. How would you go about achieving this e

Answer 1

Unspace had an article demonstrating this functionality: Endless Pageless: No More Next Page. Their demonstration page is here (dead, for reference).

This particular example uses RoR and Prototype.