As the Page Scrolls
http://www.uie.com/articles/page_scrolling/

Spool, Jared M.
User Interface Engineering
1998

Abstract:

Users say they don’t like to scroll. As a result, many designers try to keep their web pages short. But one of the most significant findings of our research on web-site usability is that users are perfectly willing to scroll. However, they’ll only do it if the page gives them strong clues that scrolling will help them find what they’re looking for.